How's about sending the kids to grandma's for a while, and renting a movie at home?
Seems you have forgotten that Grandma's other half, Grandpa, most likely is the Father you want to babysit. Oh sorry I forgot, they don't have a life as they are too busy trying to save their SS that their kids don't want to pay.
That's it -- a babysitter and time alone. And a steak dinner.