I was adopted and have known my birth family for many years. I just did a DNA test and found I have 702 matching cM's with the daughter of my mother's brother (making her my 1st cousin). This helps validate my mother.

However, I DO NOT match any relatives of my supposed birth father. They divorced before I was born.

I am being shown two 2nd cousin range matches with 419 & 468 cM's. They are a brother and sister. We have talked and are trying to understand if their father's brother could be my father.

If so, wouldn't they be 1st cousins also, like on my mothers side?

Their matching cM's are almost half of those of the matching 1st cousin on my mothers side. That leads me to believe my father is in their family but another generation back. Perhaps he is their grandfather or on of his brothers.