Rich family, but your not, and people think you are rich?

I have parents with money. They have never given any to me or my siblings or any grandchildren. They don't play the parent or grandparent role. They keep to themselves, spend lavishly and call when they need to vent about getting older. People have always umed i have money or that i would eventually get it. They expect me to pick up the tab or give more, when monetary input is needed. Anyone else experience this?