I chatted with my boyfriends brother.
Like on a chat messenger?
Yes, I was bored so I opened the chat
It's good that you can have a relationship with your boyfriends family. Getting along with them can ease a lot of unnecessary tension.
I think I might tell him how I find him attractive.
I'm glad that you are getting along with your boyfriends family. However, I don't think you should hit on your boyfriend's brother because that will make everything awkward. You should keep your feelings to yourself.