See, this is why you are a retard.
To my mother I am her son.
My sister has kids, and to my mother they are her grand kids.

Its a family unit...science says so!

By your logic your mother is not part of your family unit, neither is your father, or any potential siblings, but kids are.
But then, to those kids, you are not part of their family unit!

Well dont shit eater, you totally made yourself look like a tool.......again!