Brian Austin Green is praising Megan Fox's co-parenting as he exchanges barbs with ex-Vanessa Marcil. Following Vanessa's recent allegations in an Instagram Stories Q&A that she raised her and Brian's son Kassius, 20, "alone," the actor issued a heated response on his own Insta in which he claimed that he and former wife Megan "bust our asses" for Kassius because Vanessa "was rarely there." As of Saturday, Vanessa had yet to weigh in further.