It seems like she was actually his step-mother, but...
"Our unwavering commitment to always do the right thing has led us to severe ties with an employee who expressed views that do not align with our culture..."
This could have been a conversation like:
"You're step-son is a racist murderer."
"No. He really isn't, he was doing his job."
"FIRED!"
I hope we hear her side of this soon.