How should I record and report information which conflicts (e.g. differing birth dates for what I believe to be the same person)?

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    How are you recording the information (on paper or some specific software product)?
    – M Smith
    Commented Oct 9, 2012 at 23:06
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    Hypothetically it doesn't really matter, but I was thinking of an example where I was entering it into something like The Master Genealogist.
    – Mat
    Commented Oct 9, 2012 at 23:11
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    @Mat Looking over the answers and the question, the terminology "deal with" might be hiding two questions, both very important. One is about recording and reporting/giving notice of the conflict; while the other is about resolving the conflict and the associated record, etc. You may want to clarify this in your question. In any even, I hope you won't rust to spot an answer on this one.
    – GeneJ
    Commented Oct 10, 2012 at 0:17
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    -1 I agree with @GeneJ. You're question is too broad. Clarifying the circumstances would help solicit more quality answers.
    – user47
    Commented Oct 10, 2012 at 2:13
  • @GeneJ I agree, but it's perhaps a little late to change this now we have some good answers. I could split the question into two record and report, but the two are perhaps intertwined enough that I really do want to know how to deal with them.
    – Mat
    Commented Oct 10, 2012 at 18:20

6 Answers 6


I have spent a lot of time thinking about conflicting and incorrect data and have come to the conclusion that conflicting data is not a bad thing. Indeed, the conflicting data may be the very thing that leads to more information about the individual.

Given the example of conflicting birthday dates, consider the source of the conflict. It may by a simple error of two people entering the date differently, a lot of sources are hard to read after all. Another possibility is that there are different documents with the conflicting dates. Lastly, one of the date made be forged, made up, best guess etc.

Regardless of the source of the conflict, the conflict exists and is codified in documentation and research to one degree or another. Once you come to a conclusion which is the right date, the temptation is to toss the "incorrect" one. This is wrong for a few reasons.

First, you may decide down the road that the one deemed incorrect is really the correct one causing you to have to go back and possibly research again. Second, some records will have one date and some the other. By keeping both dates it makes relating to these other records easier.

  • @M Smith, I am not sure what you mean by "keeping both dates."
    – GeneJ
    Commented Oct 10, 2012 at 0:12
  • To record both dates, I believe.
    – Luke_0
    Commented Oct 10, 2012 at 0:12
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    @Luke yes to keep both dates and to treat them as important as you never know which one may lead to a future connection.
    – M Smith
    Commented Oct 10, 2012 at 15:47

It's very important to keep track of all sources, and to understand whether these sources are primary or secondary. A good primary source for a birth is the birth certificate or a record of a birth. A death certificate is a secondary source for a birth because those facts were not necessarily provided by a reliable source.

Sometimes the same original information is republished in many places, which does not make those sources independent. So you can't trust a majority vote either.

If at some point you do find conflicting information (and you will!) having kept the source references for each fact will help you interpret the new (or the old) information. Many tools for creating and maintaining your family trees provide mechanisms to import or to create source information for facts associate with people in your trees. You should familiarize yourself with how these work, and record as much as you can. Relying on memory is not a viable option.

  • GeneG (ha!) Typo perhaps? I'm used to seeing sources categorized as original (birth record) or derivative (birth index) but information as primary or secondary. It's the information that is in conflict, right?
    – GeneJ
    Commented Oct 10, 2012 at 2:24
  • yes, good point! Commented Oct 10, 2012 at 2:55

Sometimes "conflicting information" can be evidence of something else and worthy of recording in its own right.

I have a date of birth for my father from his Naval enlistment that does not match any other document. Like thousands of other men, he lied about his age to go to war. I recorded both dates as "birth" events with appropriate annotations on each. Knowing that he falsified his birth details tells me something important about his life.

More significantly, I now have an original "Certified Copy of Entry in the Register Book of Births" with a date of issue between the time he applied to join and when he shipped out. I infer that someone (his mother?) was attempting to prove that he was not eligible to serve.

At face value, the d.o.b. on his service record was simply "wrong". In fact it opens up several rich stories in Family History. I need to preserve those opportunities.

  • 1
    This is a key observation - eg an "adjusted" DoB may may result in conflicting ages.
    – Andrew
    Commented Oct 11, 2012 at 16:46

There's a mention somewhere in this thread about "multiple entries for the same fact". I think this terminology helps confuse the core, and often asked, question.

Your research may be citing multiple sources. Each source will usually yield one value for each datum (e.g. date of birth, age, personal name, place of birth) but none of these should be described as facts. They're all items of evidence that may not agree 100%. Small variations are common as in ages on a census or misspellings of a personal name. Other variations may be deliberate or accidental errors, or it could mean that you're actually dealing with more than one distinct person. All that evidence is therefore important and should be kept, together with references to the associated sources.

What you record as the primary data for your person are really conclusions formed by assessing the sum of the evidence available. Taking date-of-birth as a specific case, you will probably want just a single date-of-birth to be displayed. This doesn't mean that the conflicting dates or ages have been lost or discarded - they're the evidence from which you selected your primary value. Hopefully, you would document how you reached your conclusion if there was any conflict.

A more difficult situation is where you may have formed a finite set of conclusions rather than a single one. For instance, someone born in 'November of 1853 or 1854' but the evidence is not yet sufficient to chose one. This could be handled by picking an arbitrary one, or selecting an enclosing range, but adding a very important note about the actual possibilities.


When dealing with conflicting information the number of source you have will matter as well as the source itself.

For example if you have two conflicting dates from two sources, source A is from a birth certificate and source two is from a newspaper article, I would list the birthdate on the birth certificate and in the notes on the person I would list the newspaper article and the 2nd possible date. The birth certificate being a more authoritative source I would trust it over the newspaper.

If you have three newspapers, two of which list the same date and a third listing a different date I would list the date from the first two papers and in the notes of the person I would list the 3rd newspaper.

As beachbuddah mentioned its not just about the number of sources listing the date. If I found a birth certificate and three newspapers, all of the news papers listing a different date from the birth certificate I would list the date on the certificate and keeps notes on the newspapers.

It is important to always keeps notes on all the sources you find. If in the future you find the birth certificate to be erroneous in some way or perhaps another document that would be more such as a church record that would match others in your notes you may change what date you list for the persons birth date.

Never throw anything out either. If you find a source to be false, keep the source in your notes and mark it as false with the reasons for doing so.

Some software used to maintain family trees have features to support multiple entries like this, each with its own source. Some software known to support this includes:

  • Mac Family Tree
  • Family Tree Maker
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    Some family tree programs also allow multiple entries for the same fact, plus allow you to choose one as the primary. I've done this in Family Tree Maker for my great-grandmother's birthdate -- I don't have a birth certificate for her, and other records show varied birthdates. So I've entered them all as alternate birthdate facts and sourced each one appropriately.
    – efgen
    Commented Oct 9, 2012 at 22:59
  • @Justin808, I think your answer would be better without the reference to the number of "matches."
    – GeneJ
    Commented Oct 10, 2012 at 0:03
  • It's not so much the number of sources as the number of independent sources. Two newspapers can be only one source if one copied the first. (Or to take another example, 50 copied family trees containing a 70y old woman giving birth aren't more persuasive than 1 tree with original research).
    – AdrianB38
    Commented Oct 23, 2012 at 21:42
  • @AdrianB38 - I was referring to the number of newspaper sources, i.e. two different newspapers report the same fact. Not that 2 newspapers would be a single source for a fact.
    – Justin808
    Commented Oct 23, 2012 at 22:01

I have found that I can't rush the past. If I have conflicting information, it's incumbent on me to continue my research. I can't get overly excited about a majority of a given date. Just because there are more of one than another, that doesn't make them right. Could be that they were all copied from the same erroneous source.

And that's the key, finding the source closest to the original date you're trying to pin down. The further from that yesterday and the closer to today, the more likely that the date may not be the correct one.

Hope this helps.

  • While you make a good point about continuing the research to resolve the conflicting information, this doesn't really answer the stated question, which was how to document the conflicts. If you have a good method for documenting your conflicts, you can improve your answer by adding that information.
    – efgen
    Commented Oct 17, 2012 at 2:51

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