Kotch

Joseph Kotcher, a retired traveling salesman, lives with his son Gerald and daughter-in-law Wilma in Los Angeles. He dotes upon his young grandson Duncan irritating high-strung Wilma to the point that she hires Erica, a high school student, as a regular babysitter to replace his efforts. However, Grandpa Kotcher still gets on her nerves, and she convinces Gerald to move him out... (imdb)