If this is true, it makes them look like horrible people!

Brian Austin Green's ex Vanessa Marcil recently put him on blast on Instagram, claiming that he and wife Megan Fox disowned his 16-year-old son Kassius after failing to win primary custody years ago.

"As usual I can’t wait to see @lisalingstagram show on custody cases. 12 years ago I was served legal papers and then spent 8 years+ defending myself and my son in custody court in response to his father & his stepmother trying to get full custody(that means I would have seen my son four days a month) and then asking me to pay them child support. They lost that case & a civil case asking me for 200,000," the actress began.

"I never spoke publicly in order to protect my then young son from paparazzi that used to follow him & terrify him. I had also never asked for child support of any kind and had never tried to take time away from Kass’ dad seeing him. Ever. In the end they lost all of these court cases. The judge called them all “Frivolous” They always had 50% custody and still did when court ended as I had and have NEVER asked for full custody," she continued.

"Then, 5 years ago on their own they decided to completely cut Kass out of their lives and his younger brothers’ lives. Kass has never met his youngest brother and is not allowed to know where his bio father, stepmother and three younger brothers live. Custody cases hurt the children only and the truth shall set us all free. Put the kids first you guys. There shouldn’t be a “more important parent” kids love both parents equally no matter what either parent’s struggles may be. Kass has been truly heartbroken since being cut out of his other families lives with NO explanation. Let’s do better for our kids. Let’s share our stories. #Buddhakids," she concluded.

The 90210 star has yet to respond to the allegations, but if you look at his social media accounts, you can see that he's doing his best to play the role of supportive father, frequently posting pics of the teen. So is it all a big cover-up, or is he being unfairly accused? Guess we'll have to wait and see...