Fat Albert and the Cosby Kids (1972) : 7x8

Fat Albert and the gang meet Marcus, a good athlete who's recently moved into the neighborhood. They invite him to play in an upcoming father/son baseball game, but he's reluctant to go, mentioning his father is out of town. But the true reason is revealed when he shows up after all, and everyone sees him drunk. It's eventually learned that Marcus' father in an alcoholic. Marcus and his sister Michelle run away from home to avoid the problem. After initially getting into danger, they go to the gang's clubhouse where Fat Albert convinces them to go to an Alcoholics Anonymous meeting. There, they learn not to be ashamed or angry of their father and decide to return home to help their mother face the situation in hopes they can get him to recovery.