Martin Lartigue

War of the Buttons is a film directed by Yves Robert, about two rival kid gangs whose playful combats escalate into violence. The title derives from the buttons that are cut-off from the rival team's clothes as combat trophies. (wikipedia.org)

Rosalie is amicably divorced, dividing her time between her mother's house, with her siblings and small daughter, and César's. He's self made, a scrap iron king, outgoing, amiable, in love with her. Enter David, an artist and Rosalie's flame before her marriage. In a quiet, brooding way, he seeks to reclaim Rosalie. César's jealous outbursts and attempts at cunning backfire and send Rosalie into David's arms. César keeps trying: he buys Rosalie's childhood seaside vacation home as a gift, win (imdb)