The question is not "should you be okay with his brother coming?" The question is are you okay with his brother coming? This is a time to think about yourself and realistically evaluate what will make things easier for you. You might not have all these answers initially.

I found that honesty between my husband and me while going through this very difficult time spared us a lot of misunderstanding. He is normally very outgoing and social, but during most of the treatment time it took all of his energy to just survive. BTW, his normal personality came back - there is hope.