It is up to you and what you are comfortable with. I've never had parents ask about others or tell me about their child (except one mom I interviewed did say they hadn't had them yet as they were undecided) and personally, I would not be comfortable telling other parents if other kids were vaccinated or not. It is such a controversial topic for some and I feel it is confidential.

I personally don't care if a child is vaccinated or not so I don't even bother asking. If I had a parent say that they didn't want unvaccinated children in my care than they would maybe need to find another daycare.

I can't really remember, but I don't even think when I worked in centres we were allowed to ask. I believe the only thing we could ask is if the child has HIV. I can't remember for certain though!!