It won’t get you any money out of this project, but if I were in this situation I would include a credit slide: “Cameras Joe Smith and Charlie Gray; edited by Charlie Gray.”
Then, as Mike suggests, never work for or with this guy again. I definitely would NOT approach the couple, who are not a party to the deception, and I definitely would not, under any circumstances — including for my old mother begging on her knees — “work” for anyone again without compensation unless your doing it as a public service.
