For Men: your BIL

Simple, you don't get annoyed or get into gossiping about him.
Realize it's a temporary thing and whether making an issue of it is really worth it.
If it's not, you chill and let it be, if it's not then you make your position clear.
But guys don't seem to get in each others face or get bent out of shape on minor things.
That's just the way it is.

How do you handle it when he is in town or when you're in his town? Or like, lets say you want to visit your sister, which is totally your right? What happens?

Re: For Men: your BIL

I normally ignore his attitude, If he is in bad mood, I dont talk to him and avoid him. I see my sister and nephew when i am there and whenever i want to. sometime he is very cool and happy about it. even with his moods whenever he come to UK alone or with family, he still stays with us!