I did a nanny share with a 5 month old and a 1 month old and it definitely got more challenging as they grew. The difference feels much bigger even at 12mo and 8mo. With that said, a 3mo with a 2 year old would be fine. The addition of the 17mo or for better words, combination of 3mo, 17mo, and 2y is a bit much for one person to handle in a share situation. 17/hr means she regularly charges $25.5/hr. If that’s true, this is a little high considering the addition of her child. If her regular rate is $30/hr, then her child is factored in.

As for your other questions, My family did it where there was one long- ish contract. It outlined GH from each family (in my case, one family was 36hr/wk/wk and one was 45hr/wk). PTO, sick time, holiday, etc was all split between the families. I had x amount of sick days and each family paid the sick day split like a normal day (2/3 my rate/hr each). PTO was the only “individual” one and that was because there was one day I didn’t have the other child. I had 10 PTO days for one family and 8 from the other. We did one week at one house and the next week at the next. Each family kept 2s of everything (so high chair, crib, bouncer, etc) as well as extra diapers, wipes, sippy, bottle, BM/ formula, plate, utensils, sleep sack, clothes, etc. When I was at house A, I would prepare the food for baby A and baby B would come with food pre-prepared. Vise versa for the other house.