I found this topic kinda fun, and instead of digging up the old one, I'll make a new one. Dear little sims, please make sure that you're actually home when you invite my sim over, especially when ...
Dear little Sims... Please don't stop doing what I asked you to do every time I select another sim to be active. If you're not selected you're still supposed to finish cooking or painting or whatever I've asked you to do, ok.
Dear little Sim toddlers... Stop waddling to the furthest chair on the house to eat when you're really hungry. There are plenty of chairs downstairs for you, you don't have to go eat your food upstairs just because your sister is there doing her homework.