Family on facebook, yes or no?

I’m friends with my dad on facebook because he’s cool and doesn’t ever really get on or stalk my page. However, I have a cousin who’s about 15 years older than me and he is always commenting on everything I do with what he thinks are witty and clever, really they’re a bit annoying. Some of my friends have even noticed and asked who he was. I deleted him once and he noticed and asked his wife about it and I felt bad and had to add him again. Should I delete him again, or just hint to take it easy or ignore it or what?

I also feel like I have to moderate my facebook way too much because of my very conservative family. Lord help me if a drunken picture escapes my untagging. My mom would beat me with a toaster.