I have a weird family too
My siblings are alright with my girls, one of my brothers is actually named as guardian in our Will.

My DH has 3 siblings: 1st brother lives in the same town as us with two preschoolers. We get on ok but don't see each other much on account of being so busy. 2nd brother is married without kids, lives in Welly, but when they do come up (not often) they definitely put in an effort. 3rd sibling is a sister still in highschool, she seems not interested or too busy... or perhaps just doesn't know what to do? So I guess our siblings are probably roughly "normal".
On the other hand, my parents (who live 16km from us) barely know my kids. We haven't created any obstacles to that, I just don't think it has occurred to them to get to know anymore of our family than DH and me. But in saying that, they were like that for us as kids too.
DH's parents (same distance) are all over the show. If they are busy, we don't see them at all. If they aren't busy then MIL is alright - at least interested in the girls - and FIL is demanding - "come sit on my knee...or i'll be sad" etc when he hasn't even seen them for months.