My Three Sons: Season 9, Episode 13
The New Room (28 Dec. 1968)
Steve draws up plans to have one of the bedrooms enlarged to include a nursery. The contractor hired to do the work ends up locking horns with everyone except Katie, who manages to charm him. It turns out that his son's wife is expecting his first grandchild, and after never having a daughter, he's blessed with a granddaughter.
Director:Frederick De Cordova