Grandma Banks comes for a visit and everybody is thrilled to see her especially Philip. Philip thinks of his mom as old and begins to treat her that way. He even goes so far as to invite an elderly lady who lives near over to keep his mom company.
Granny has different ideas, though. She wants to act how she feels not how old she is. She meets the repair man who is at the Banks house to fix something and is attracted to him. She sneaks out to have a date with him.
The Banks family invite him to dinner and all Philip does is make comments about his father. Finally, Granny talks to her son and explains a few things to him which help him understand things better.