I have three with one on the way. It’s a constant struggle to keep the place livable. Before I had children I was not a neat person and kept things livable by not doing things that made mess and staying out as much as possible. Can’t do that with kids, so what’s the trick?
I second this. We have a very similar situation. I will note that I’ve begun using a “carrot” approach as well as the stick. I now keep relatively cheap and fun crafts and electronics around. Cleaning a room and helping out will earn them a fun craft and that seems to work REALLY well lately. If you know how to solder you can buy a bunch of cheap but fun kits that you can do with them and reward them with as prizes. Today’s (if they are compliant and helpful) is an FM radio. I do bigger ones if they do more, and I expect more on a weekend.