L’été en pente douce 1987 on netflix

When he inherits the family house and property after his mother’s death, aspiring novelist Fane returns home with his bimbo girlfriend Lilas. He must care for his idiot brother Mo and contend with a greedy garage owner who covets Fane’s property to expand his business. When efforts to buy the property are fruitless, the mechanic incites the townsfolk against the strange trio.