Le tuteur (1996)

Nina, nine years old, loses her parents Hélène and Jean in a car accident. A few months later, in front of the reunited family, the guardianship judge opens the will that designates Thomas, Hélène's brother, as Nina's guardian. But Thomas, 35 years old, shares his apartment with Hervé, an architect, with whom he has been in a relationship for 5 years.

Unfortunately the movie Le tuteur is not yet available on HBO Max.