Just refuse to add them
on the basis that they have to be 13 to have a Facebook account and even then you refuse to be friends with 13 year olds.

I also refuse to be Facebook friends with any relatives from my parents' generation, including my parents.
( crackhouseceilidhband Fuck off back to Mumsnet, Tue 13 Apr 2010, 11:46, 2 replies, latest was 16 years ago)

I'm with you on the relatives thing
my bro set my dad up with a facebook account. why the fuck would he do that and why would I allow him to see what I get up to?
( Vipros. clever got me this far, then tricky got me in, Tue 13 Apr 2010, 11:47, Reply)

God yes
since my Mum discovered Facebook I get her commenting on my status a lot, which is actually OK, but telling me off for swearing on the internet. I'm 31!
(Darth Foxtrot A one-man army dedicated to making fetch happen, Tue 13 Apr 2010, 11:50, Reply)

my boyfriend's dad is on his facebook
and he uses it to perv on pictures of me.
( Kitty v1.0 desperately naive, Tue 13 Apr 2010, 11:53, Reply)

Oh yeah
Not at all disgusting and strange.
(PenguinOfDeath is Scottish, and most likely angry, Tue 13 Apr 2010, 11:56, Reply)

Well it is a bit
Just not by our standards
(Darth Foxtrot A one-man army dedicated to making fetch happen, Tue 13 Apr 2010, 12:04, Reply)

Mouseover...

(PenguinOfDeath is Scottish, and most likely angry, Tue 13 Apr 2010, 12:09, Reply)

I am going to remove them soon when it's blown over
but I want them to be traumatised first
( Roota zweeeeeoooooowm, Tue 13 Apr 2010, 11:48, Reply)