You should follow someones rules when in their home.
Alice is babysitting her neighbor's children and has been told by their parents that they are not allowed to have sugary treats on weekdays.
Alice wants to have a snack.
Alice cuts up some carrot sticks and fruit from the refrigerator for herself and the kids.
Alice takes the kids out and buys some cupcakes for all of them to share.
Alice and the kids have a healthy snack and their parents continue to employ Alice.
Alice gets in trouble with the parents and is not hired to babysit again.