A few years ago, my dad retired from his job. At first, things went well, but recently, I've noticed that quitting his job has led to lots of negatives for him and our family. Since my mom is still working, my dad just stays home alone during the daytime, with no social interaction. Since my parents are immigrants, they don't have very many friends here in the first place. So most of the time, my dad only talks to our immediate family. Because of this, I think my dad's English is getting worse, and he's also losing his sense of basic social courtesy and mannerisms.
I've also noticed that my dad's temperament is also getting worse these days - oftentimes he has bursts of anger at my little brother for no reason. In general, he's in worse of a mood now than he was before.
I think that it would be helpful to my dad and to our family if he went out more, and to be blunt; if he had a life. I know he doesn't want to work again, and he also doesn't have very many hobbies. Do you have any suggestions for what he can do during the day? Or how he can improve he temper? We've tried talking to him about it, but he's extremely stubborn, and he only gets angrier when we mention it :(