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Question: Whose more closely related to my cousin!?
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!.


Best Answer - Chosen by Asker:
You and his double cousin are equally related to him!. Double first cousins are genetically as related as half-siblings!.Www@QuestionHome@Com

You are half siblings by your MOTHER with all that mitochondrial DNA!.
(Which is inherited ONLY from the mother )
I would easily say YOU are the most related to your half brother!.Www@QuestionHome@Com