The Love Boat - S2E27: Third Wheel/Grandmother's Day/Second String Mom

What's the Story?

Gopher gives his parents a cruise as a Mother's Day present. Gopher's father grows jealous of the close relationship between mother and son. An older couple, who has finally seen its youngest child move out of the house, is stunned by an unexpected pregnancy. A widower's teenage daughters repeatedly reject his new wife, but must rely on her help when they get into a jam in Mexico.