Well done OP.
You are sensible, thank god.
Your daughter is lucky to have one parent NOT prepared to facilitate her being abused.
I appreciate I am being harsh, but your daughter's father has enabled her abuse, and that is so shocking.
He may be a nice man but he is deeply wrong and mistaken.
My husband and most fathers would go through a SIL for a short cut at what your daughter has shared.
Your SIL is a mean, nasty, thieving, abusive bully.
His addiction to gambling is just another adjective to add to his description.
Blocking him and his manipulation IS the only way forward.
As is telling his CO that you don't want him positioned near your daughter.
I would go so far as to tell the CO that you will involve the police and blow this up publicly if he facilitates this abuser.
Play hardball, just like your manipulative SIL.
6 months as far away as possible is a start.
You owe him NOTHING.
Every time I come on this thread I recall your daughter so bullied by him she is sending videos of her cleaning.
The utter humiliation for her.
He would be dead to me and whatever happens to him in the future would NOT be my concern.
That anyone would do such a thing to MY child.
Hold on to your anger and recall how she arrived at such a place as to feel a video of her cleaning the loo was required to appease him.
He is an ABUSER.
The gambling didn't make him abuse.