When the family tells Grandpa to go see a lawyer to make up his will, he refuses in doing so. In the end, Nell finds out he doesn't want to make out a will because he has nothing left to give his family.
Gimme a Break! S04E14 (“Grandpa's Will”) first aired on January 5, 1985.
In the US, Gimme a Break! season 4 — including this episode — is available on The Roku Channel.