Depends totally on which family members.
. Id help my folks out if I had any to spare and they needed it. I don't have siblings, but I've got cousins, aunts, and uncles etc... Some of them are in the same category as my folks in that I'd help whenever I could, some are in the I'd let them rot before giving them money. What dollar amount is hard to say. But I'd start now if I had family truly in need, and I make a pretty modest salary and don't have much in the bank.
Why? Past behavior, I've seen some of my family beg, borrow, and steal from other family members who didn't have money to spare, so no way in hell would I help them even if I had the money.