Megan Fox, posted the photo on Instagram on June 21, captioning it, "My heart ❤️ Happy Fathers Day everyone. My oldest text me at 12:21am this morning :)."View this post on InstagramA post shared by Brian Austin Green (@arent_you_that_guy) on Jun 21, 2020 at 11:24am PDTBrian's oldest child is son Kassius Marcil-Green, 18, whose mom is "General Hospital," "Beverly Hills, 90210" and "Las Vegas" actress Vanessa Marcil, to whom Brian was engaged from 2001 to 2003.Brian most recently shared a photo of Kassius on Instagram in December after they saw the final "Star Wars" film together.View this post on InstagramA post shared by Brian Austin Green (@arent_you_that_guy) on Dec 21, 2019 at 5:03pm PSTOn May 18, following weeks of speculation about.