In Arle, Joseph Roulin befriended Vincent, and in the movie 'Lust for Life' at least*, helped secure the rental of the yellow house, which he shared for a time with Paul Gauguin, and in which he famously painted his bedroom.
Relying on his brother Theo for income, Vincent couldn't afford models to paint. Thankfully, Joseph Roulin was happy to sit for him.
Vincent painted the entire family.
Joseph and Augustine's 17 year old son Armand
Eleven year old Camille
Four month old Marcelle
*One of my favorite movies is 'Lust for Life'--a biography of Vincent Van Gogh.
Kirk Douglas is Vincent.