Dude, you can't pick your relatives. But you can pick whether or not you're associated with them on Facebook. I have unfriended (well, unfollowed) a couple of relatives, myself. (But in my case, it's for discussing sports too much -- and yes, I've unfollowed a couple of head-cases for the same reason.)
My ex is surprisingly religious. I feel bad if I've driven her in that direction in any way at all. Sent from my Nexus 10 using Tapatalk