Gimme a Break! (1981)

Season 5: Episode 8

Sam is taking the role of a big sister to a girl named Pam, a kid from a single-parent home. When Pam arrives at the house, Sam has other ideas of her own, when the new neighbor Chip shows up and asks her to light his pilot light on the stove. Nell is then stuck taking care of Pam, and she is a nuissance to her. Nell then finds out from Sam that Pam's mother left her father for a computer repair man, and Nell finds a way to make Pam like her in the end.