My daughter’s husband behaves quite oddly when he is visiting us. DD and SIL probably visit every several months. Maybe I am unreasonable and this is the norm. But my view when you go to stay with them the point is to interact and have a nice time TOGETHER. SIL will spend all of the day out - gym, pub watching golf, working on his laptop in a cafe. And when he does come back he runs off to the spare bedroom. It’s all very strange. My other son in law does not do this. And as a result we feel like emotionally close to him. I mean of course he is free to spend his time how he pleases but they will stay for three days and I will only see sil for a few hours in the evening. He often goes to bed very early too. He’s treated very well. I’m sort of dreading Christmas. Last year he acted the same. Makes husband and I feel like he really despises our company. We do our best to be gracious hosts and take an interest in him.