Ugh...I've had the joy of witnessing this first hand.. My husband hasn't talked to his father in several years for good reasons involving a family crisis and dad pouring fuel on the fire rather than helping. He told him exactly why he was angry. Apparently, his dad was going around telling people that my husband didn't think he was his biological dad (which, conveniently, also paints his mom as a slut), and that's why they weren't talking. HAHA WHAT?? That has never once come up, and if anyone saw the 2 side by side, they would instantly peg them as father and son. I'm pretty sure this guy was angling for our spare bedroom too. Sorry, pops! Not gonna happen.