Summer Sitter

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.