Son frère (English: His Brother) is a 2003 French film directed by Patrice Chéreau.

The screenplay, based on the Philippe Besson 2001 book Son frère (English title His Brother) was written by Chéreau and Anne-Louise Trividic.

Brothers Thomas (Bruno Todeschini) and Luc (Eric Caravaca) have an estranged relationship.

Thomas has an undetermined platelet disorder which is treated with cortisone and splenectomy—neither help.

Luc, who happens to be gay, and is in a relationship with Vincent (Sylvain Jacques), is viewed by their father as the stronger of the two and wishes it was Luc that were ill, as he could beat the illness.