I had three toddlers once, which was holy hell, my tips are to:
1. Make some sort of schedule: dinner at 6:00, bed at 8:00..etc.
2. Ditch the high chair. It sucks. Just pull a meal out of the fridge and have your toddlers grab a serving.
3. Read your toddlers to sleep!! They won’t have nightmares. Sure, it takes longer but at least all your sims all well-rested the next morning.
4. Level up your potty skill and movement skill as soon as you can, so they can go to the bathroom by themselves and climb the stairs.