Son should have kept mouth shut until he discussed the issue with you and received your approval.
I agree. Son takes after his mother, too trusting.
I watched the "best Friend" grow up from grade school. For a kid that was raised by a single parent, he does have his head screwed on right. He is respectful of his elders. It is when he is with his peers that his domineering tendency appear. My mother was stubborn and so is my dad, so I have a double dose, I can handle him.
My place isn't the BOL. It's just a stop, rest and restock location. I'll have elderly mother and mother-in-law to care for plus a wife, 1 or 2 SIL and perhaps a sister. Odds of me making it to a BOL is slim. BOL Manager can deal with the Best Friend as he sees fit.