I had a family that was rotating shifts as well and they only needed between 1 and 4 days a week.... So I just charged them my part time rate and only for the days they were there so each pay period was a different amount and I also charged them for all the stats regardless if it would have been a day they were to attend and they paid my full holidays. But I would never take a family like that again as the days were different every week and so they took up a full time spot. I have 5 full timers right now and that's how I like it.