Help me repair my parents bathroom.

It has always been my dream to fix up a room in my parents house as a gift to them for all the torture I put them thru as a kid, and I think it's something they deserve as I was a very destructive child. I've been out of work for a little over a year due to intense bowl issues that are still ongoing, so I haven't been able to help my parent at all. :(  With this project I'd like to help my parents redo their bathroom so they don't have to go into a mold infested room To get clean. The walls have been crumbling for the past 7 years and mold is making the paint peel around the tub. With your help you can help me help my parents. Any amount would be helpful :)