I'm not going to support my bastard brother
Why are you refusing to support your brother?
I know my brother is a bastard and he's betraying me by not telling me the truth.
He is still your brother and you should never use that word to describe him. Not only is it rude to call people names, but to put the blame to your brother for what his parents did is extremely immature, and we should all do what we can to take care of our family.
Whatever I'm still not supporting him.
Have you tried to talk to him about how you feel? I think that you should always try to love and care for your family members.