Kids Chore Chart Help?

My kids are 5 and 2 1/2. They both love to help and clean. I have found my 5yr old girl washing the walls before and my lil man fighting with her over the broom lol. He is too small to even lift it though and while I kept the chores based on improving some of the things we are having trouble with, so they are encouraged to do better with stickers and responsibility. I dont want my stepdaughter feeling like she may have too much on her chart when my son doesnt because of his size. (he is almost 3 and only 23lbs, he is having more serious tests done come his birthday) anyways, any ideas for smaller kids chores?? I dont want her to feel overwhelmed and I dont want him to feel left out.