tips to ask an in home babysitter?

Jessica • My rainbow baby was born on 7/25! 1 MC in May of 2014. PCOS sufferer, conceived without medication, I used plexus!! :)
We're looking at moving my son out of daycare and into an at home sitters house. She would only be watching my son, but she has 5 kids of her own ranging from age 7-11 (triplets and 2 singles) I plan on meeting up with the lady I'm interested in. Any tips, or suggestions on questions to ask? I'd appreciate the advice :).