Summer is always the time I would reassign chores to each of my kids.
I made a master list of everything that needed to be done in our home on a regular basis. Then each summer, I would run off a new copy of the list and evaluate who in our home was the best choice for each chore for the next year.
The reason I did this in the summer was because that was the best time for training each child in the chore they were responsible for. It doesn’t work to just say, “Go clean the bathroom”, for instance. Your child will do what they think makes it clean but they need to be instructed and trained as to how to do it correctly.
It’s kind of fun to change up the chores each year so everyone learns how to do all the chores eventually, and since we’re not doing school in the summer, I took that time to train everyone. By training them in their chores in the summer, the school year would flow more smoothly, rather than having to train in chores as well as doing school work.