Brothers eh Kim, you're lucky you only have one. I have four.
You're brother IS very selfish. I'm so glad that you're mom, in the end, stood her ground and is staying with you. As you have said, your brother, that's him. So let it be.
So if I were in your situation, I would enjoy my day with my mom and leave everything else behind me.
BTW, I hope that you have a super weekend and that you're works of art do well. Which i'm sure they will.
Good luck to you and enjoy your weekend.