Original title (FR): Une place pour Pierrot (A Place for Pierrot)

Pierrot, 50, is autistic and lives in a care home. His sister Camille, 45, discovers that he is being overmedicated, causing him to regress. Outraged, she decides to take him into her home while she searches for a place that is better suited to his needs. A long quest begins.

https://www.themoviedb.org/movie/1151269-une-place-pour-pierrot