Just need a little help please

My sister is about to start chemo, and I was wondering what foods were the easiest to stomach especially at the start. I know that chemo causes a lot of nausea and I just want to make sure I can still provide her something to eat during her good days beyond hospital food.

My other question is if there is anything I can do to make sure I have healthy and high yielding bone marrow. I still need to be tested, but I'm currently my sister's best shot at a fast transplant and I don't want to fuck this up in any way.

With everything going on and my parents managing a lot of this, I just want to take that load off my parents shoulders.

If this isn't the right place to ask, I understand. I'd love to get in contact with someone or some site that could help me.