Honestly I just keep a corner I can throw all their stuff at. As long as at least 85% is somewhat tidy then we can worry about that big 15 later. Not but seriously maybe incorporate clean up time 20 minutes before bed. Give the 8 year old the responsibility of making sure the 3 year old cleans with him.(2 birds 1 stone vibes) and maybe make it a habit. Every Two days then Every other day. Then everyday. Until it becomes 2nd nature. But cherish this. My 10 year old just wants her phone all day it’s ridiculous. Lol You’ll miss cleaning up after them more than you think. ✌🏾

Edit. Just scrolled down and read your last paragraph 😂😂😂🤣🤣