He gave her a wounded look. "I am master here. I don't have to convince Twitty of anything." He'd just explained everything and then had proceded to charm his old nanny elf into cooperating.
He just hoped that his mother-in-law didn't try to hex her when she inevitably snuck over to the Bell household to make sure that the girls were properly tucked into their beds.
Drawing Katie close, he Apparated them to a spot just down the way from the restaurant.