H.T.
Hi M. -
You sound like an awesome Mom/Grandmom! When my daughter was in daycare as a baby, the daycare had a chart with all the days feedings/diaper changes/etc. This way I knew when she was fed & when she had BMs & what she was up to all day.
I also provided the diapers, clothes & made up bottles to bring.
I agree with all the other posters that you need to set up a meeting with the two parents to set boundaries. Esp the being late part, what if they were expecting you to be somewhere with the baby & you were late? As a parent, I'd be worried sick unless I received a phone call.
If DIL is worried about formula consumption, ask her to make up the bottles ahead of time to bring everyday.
When Olivia was baby, I paid $235 a week for baby care (6 weeks to 16 mos) and that was 5 years ago. Now I pay $55 a week for after school care (3pm to 6pm).
Best wishes!!!
H.