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I am his grandmother and should have 300 or more cMs connection. However, we share only 18 or so cMs. My son, (my grandson's father), shares only 17.2 cMs.

What's up?

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    Hi Carolyn, can you please edit your question including the website or tools you are using to assess the dna matches. As I see it, either your son and grandson are not your son and grandson, or there is some sort of error in the data or the way you are comparing them. A grandparent should share over 1000 cM with a grandson, and a parent should share over 3000 cM with her son. – Harry Vervet Oct 20 '18 at 5:01
  • Hi, Carolyn -- welcome to G&FH.SE! I too would like to know the company or companies involved. Did you all test at the same company? How are you comparing your results? – Jan Murphy Oct 20 '18 at 18:44

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