5x11 - Mr. Belvedere

Wesley and Heather talk their parents into letting them thow a New Years party and to get Mr. Belvedere out of the house they set him up with the Hufnagel's housekeeper, Ilsa. However, things get more serious than intended and Belvedere tries to fend off her advances. Meanwhile, Kevin becomes an unwelcome houseguest when he falls ill.