(((((((((((( LMo & family ))))))))))))))
What a very difficult situation you are all in and I'm so sorry. I was my mom's main caretaker when she was dying of brain cancer. I know that everyone who is watching a loved one fail looks at their roles differently than the others. It can be hard to mesh them all together so they are working well.
I think you should definitely have a little sitdown with your brother...very lovingly and let him know that your feelings have been hurt by him....telling him you understand how he wants to spend as much time with your dad...but that you and stepmom also want to spend as much quality time with him too. It's possible he has no idea how his actions and words are hurting you and your stepmom right now.
I hope you can find a way to work it all out. And please know that your dad knows what you did for him by baking all those goodies....even if he can't speak most times, he can still think and hear
xoxoxo
sabby