He's My Brother / Zeke and Zelda / Teach Me Tonight

Two stowaways pretend to be another couple and they start charging things, not knowing that the crew members, who approve of the charges, will have to pay for items they charge but don't pay for. A woman meets the author of a book she's reading. And Doc's brother and sister-in-law come aboard and his brother has a lot of pent-up resentment against him.