I have done the Autosomal DNA test through Ancestry.com and uploaded it gedmatch.com.
In Ancestry.com I matched several people that would be 1st or 2nd cousins. I also matched with them on gedmatch.com.
The problem is that I do not have any of their family names in my tree. My parents and grandparents are all deceased. My dad was an only child.
I can trace and connect with cousins on my mother's side and only my grandmother on my dad's side. My DNA matches all have a last name in common that I do not have.
I am beginning to think that my dad is my dad, but my grandpa is not my biological grandpa. So... I am not sure where to go from here in my family history.
My question is if you match on your DNA with other's that are 1st or 2nd generations then how could that show up if we don't share a common relative? If you are 1 generation, does that mean cousin or could it be sibling?
Could this Autosomal DNA test be wrong in its relationships?