My Father is my Mother's Brother(2018)

Original title: Тато — мамин брат

Tolik, an openly gay bohemian singer/artist in the Ukrainian underground scene, is raising his niece Katya, a stubborn little girl who has taken to calling him Dad. Her mother, Anya, is both at the heart of the film and almost doomed to the fringes, adrift between solitude and stays in a psychiatric hospital.