@Joseph
If a babysitter were to be left alone in our home and expected to feed the children, yes we’d use only Frum babysitters.
In an instance such as watching the grandchildren at a chassunah we’re hosting and are both present and providing all food and drink, there is no reason for the babysitter to even be Jewish. In fact I’d rather a non-Jew than have a non-frum Jew as a role model or person in authority,
