I grew up in this similar setting. Straight to point... they've got nothing better else to do but to meddle into people's business, are unhappy about their own lives (hence, they nitpick yours and gossip to make themselves feel better), they're insecure and possibly jealous of your current and future success. What did I do? I cut all ties once I moved out in my mid 20's. Years later, what have I experienced? They're super curious about me, wanting to know more about me. So.. they have not changed, but I have. I'm much more happier, because I don't listen to their childish outcries for attention.