The Munsters: Grandpa's Lost Wife (1966) (TV)

Synopsis [spoilers]: Herman finds an ad on Shocking Detective Stories magazine offering a reward for the whereabouts of a man; to his astonishment, the man in the photo in none other than Grandpa. Herman decides to write a letter to the person who posted the ad and thus collect the reward, but Lily talks him out of the idea. Through an anonymous phone call, Herman finds out that the person looking for Grandpa is his alleged wife in Sioux City, Iowa. They talk to Grandpa about it, but he denies having an abandoned wife in that city. To complicate things further, Eddie sees the letter that Herman wrote and mails it. Soon they receive the visit of the lady from Sioux City, but Grandpa stays hidden in his laboratory. Later on, he decides to pay his alleged wife a visit at the hotel. She recalls moments of their common life, but Grandpa remembers none of them; he gets interested, though, since she seems to be rich. He signs a paper admitting he is her husband and goes home to fetch his things and move in with her. When he comes back to the hotel he is shocked to learn that it was all a fraud: the woman had to prove she was married in order to collect an inheritance (oh dear) and chose Grandpa from an old photo of his magician's days in a magazine; she though it was very likely that he would be dead, so she placed the ad in the hope that no one would answer it; she had to do it in order to convince she really was married (oh dear). Grandpa returns to the Munsters' house but Herman refuses to take him back because he was greedy and abandoned his family; Lily convinces Herman to forgive Grandpa; then Grandpa asks Herman for a loan and Herman expels him again; Grandpa begs to be let in (he even fabricates snow), and finally succeeds.

Saw it dubbed in Portuguese.