I'm not sure how to tactfully bring it up, but guaranteed hours are incredibly important in a share for everyone involved. The nanny should be able to expect her full rate even if one child is absent for one reason or another, and the present family shouldn't have to pick up the slack. I had a share in the past where one family was often absent for whatever reason and the mom just could not understand why she should have to pay. She was wonderful in most other ways, but it was a constant awkward conversation in which she would try to get out of paying or to bank her hours some way.

How will you handle sick children? Will the healthy child get the nanny?
-this is a big one. I am the nanny who's MB/DB sent their child over sick.

What type of relationship will the two families have?
-this is important. You want to make sure the share won't break up.

Will you allow me to have input on the double stroller?

Ask both sets of parents what their opinion is on various topics. Outings, housework, etc.
-It's important to make sure that they are on the same page in order to avoid trouble down the road.

I have an interview Saturday for a nanny share for two newborns born 5 days apart. What questions should i sure to ask that are specific for a share and any other information you guys can give would be greatly appreciated thanks