The last thing that you want is having an entertainer come to an event that has something to do with family and they are not clean people, meaning they are using dirty language, or being inappropriate. What would that do for your guest and most of all you and your reputation?
You want to ask the questions that will let you know for sure what you are getting into and what you are hiring. Is the entertainment kid friendly and family fun? Or if this event is for over 21 do you want to keep things Clean or does it matter? You only want memorable talks about your family events.