I've got a few Facebook friends who I've just blocked from my wall feed, for reasons like that. In this case they're not family, but I've known them a long, long time and I guess I want to keep them as friends, but man, I do not need the daily spew. So they're blocked, I don't have to see their shit, but otherwise we cool.
I had one other friend in that same boat who I finally just cut. In this case, I actually commented on some of his ramblings, even asked questions sometimes, but he never responded. I wondered WTF, and looked and saw that he has 1400 Friends. Seriously? So anyway, I figured he wouldn't miss me.