DEAR MISS MANNERS: I’m a 23-year-old lady with a 54-year-old father. At restaurants, he often makes comments to the waitresses, asking them if they’re married or have a significant other. It terribly embarrasses me, because these questions are more creepy than he thinks. Is there any advice you could give me to politely tell him that he’s being a creepy old man? GENTLE READER: “Asking strangers in a professional setting about their relationship status is just not proper. I’m sure you don’t want to come across to young women as predatory.” And if your father insists that he comes from a differe…