Yep, he was so focused on his career (an electrical engineer) that he usually doesn't know what to talk about with his own kids when they come to visit.

He really misses his work and the people he could talk with about work. Anything I talk about feels like useless chatter to him.

You are right that he is taking out his resentments on me and I really hope he will find something to interest him soon because he is so angry when I'm interested in things.

Your post was helpful and I thank you for sharing.