I found a 1st cousin not connected to my mom and my dad was an only child. She has 1053 cM on 40 DNA segments. I have heard people say 1st cousins can also be half-siblings?
If she is a first cousin and my dad had a half-sibling he did not know, would her cm be that high and if so how could I find this aunt/or uncle if he doesn't know we exist?
I am female..my mom did a DNA test and she does not match with this cousin. My Dad is no longer living.