why are cousins either
horrible friends from hell who are here to torture your soul and destroy everything you love and only want to make you miserable. they are also spoiled brats whose parents do not parent.
!or!
your best friends, spare siblings, adventure buddies, partners in crime and they will help you hide the body.
no in between.
Actually there is an in-between, when they're all in their 20s or so by the time your brain has developed enough to not be stupid all the time:
Just some people who I'm somehow related to that I don't see very often but generally get along with if I talk to them
One of my cousins is in his 20s and he has ADHD/Autism and he's like the only one I've had an engaging convo with in the past year
Oh but one of my cousins had a child and she is the Worst Hyperactive Child Ever but her parents are actually pretty good- I just hate children and she somehow developed an attachment to me