Don't feel stupid.
You didn't know the truth.
You do now.
So does your daughter.
Tell the CO he has confirmed that he is gambling and he is verbally abusing and harassing your family.
Tell the CO, you won't hesitate to go public and involve the police, if he is not stopped.
I also would tell the CO that he has recruited his next victim and that by telling him, he has the heads up and obligation to protect the poor woman and her family.
Block his family, my bet is they know a lot more about his character than they are letting on!
Your daughter will survive and thrive, but thank goodness there are no children involved, you would never have been free of him.
The sooner that divorce goes through tge better.
Advise her to go slow with this new relationship.
She needs to process and grieve.
She put up with a lot of shit from him that shows she is vulnerable to being miss treated.
She needs to know why she put herself in a position that she would think it acceptable to send him a video of her cleaning.
This is critical to her future happiness.