When I invite him to supplement the tip, he says, “If you don’t want to tip appropriately, you shouldn’t go out to eat.”

When we are out as a family, my 30-year-old millionaire son never pays for anything. He eats more than any of us and never reaches for his wallet, not even to help with the tip. This has been going on for years,

I’m writing because my son never fails to criticize the amount of the tip I do leave. I generally leave something in the 15% to 18% range, which he finds offensive. He works in the hospitality industry and insists that 20% is minimum.

My son is a millionaire. When we go out to dinner, though, he doesn't ever pay a cent. Instead, he calls me cheap for tipping too little. Your advice?

When we are out as a family, my 30-year-old, millionaire son never pays for anything. He eats more than any of us and never reaches for his wallet, not even to help with the tip.

Dear Abby advises a father whose millionaire son gives him grief for not tipping the proper amount when taking the family out to eat.