"They are getting professional help and trying to save their marriage," the source explains. "But their relationship is very volatile. They are trying to do what's best for their kids."
In his filing, plastic surgeon Nassif asked for joint custody of his three sons, Gavin, 9, and twins Colin and Christian, 6. The couple's marital woes will play out during The Real Housewives of Beverly Hills' third season, airing this fall on Bravo.