Jayne is back this year as our summer babysitter. She takes the girls out to classes, swimming, biking, etc. Her main job is to get them out of the house a few times a week. The girls like to be out with Jayne, but they don't like that we call her our babysitter.
As the blond twin says, "We're not babies, so we don't need a babysitter. Jayne is our summer sitter." They both object every time we refer to Jayne as their babysitter.
I'm not sure if it's a promotion or just a title change, but Jayne is now our summer sitter. It's actually kind of cute that the girls discussed her title and changed it, so we'll go with it.