Family is important. But if they’re annoying, make sure you live at least a hundred miles away. Try to make the distance greater if they are the types who would try and steal a boyfriend (or girlfriend) from you, if they would try to borrow money, or if they only take and never give anything in return. That giving-and-taking logic doesn't necessarily apply to material things. It can also apply to emotional currency. If they only want to complain or tell you all about their day, and never show the courtesy to listen to anything you have to say, they're not worth having around. That same logic applies to friends, too. If your friend/cousin/sister/you-name-it only wants to talk about her life (men are guilty of this, too, I should add) but won't spare a moment to listen to you when you're feeling down, dealing with a dilemma, or even if you're having a great day and want to share that joy, distancing yourself from that type of person is never a bad thing.
Keep the good ones near and the bad ones, send them Christmas cards and be done with them. If they plan to visit, fancy up the house so they see you doing well, but set a time limit, too. There's a reason for the old adage, fish and company stink after three days.
If you can ward them off by saying your roof is leaking or something like that, go for it. Sometimes one must tell white lies for their own health.