A guy decides to get married.
— Well, Dad, I’ve decided! I’m going to get married.
— Who are you going to marry, son?
— Lisa, Mike’s daughter.
— Oh, don’t marry her, son. You know… Ah, fine! I’ll admit it — I sinned in my youth — in short, she’s your sister.
— Well then, maybe I’ll marry Emily, the neighbor girl.
— No, son, I messed up back in the day… she’s your sister too.
— Then how about Mandy from the next block*?***
— Don’t take her either. Same story — she’s also your sister.
At this point, Mom can’t take it anymore and yells from the kitchen:
— Don’t listen to that idiot! Marry whoever you want — he’s not your father anyway!