I want to split up my extended family.
Is there a problem between you and your extended family? Why you would do that?
I am tired of listening to their nagging.
It makes sense to be fed up with your family. But you shouldn't do anything deliberately to split them up or strain the relationship.
I'm already taking care of it, what would you do anyway?
It might be better to let your family work on their issues on their own. If you get involved, it might negatively impact you and they might blame you for interfering. All you can do is offer your support.