2 sisters married 2 brothers and each couple had sons who are cousins on both sides!. double cousins!.
However 1 sister had a daughter from a previous marriage - me!.
So 1 son is my cousin (on my mothers side) and the other son is my half brother!.
My question is - who is more closely related biologically to my half brother!. Me his half sister, or his double cousin!? Who shares the most DNA with him!?
I am fromthe same mother as him, but only share DNA on 1 side!.
The other boy has different parents, but shares DNA on both sides!.