Given that BF seems to be coercive and controlling, he may have a history of domestic abuse with a previous partner. I would google Claire's Law which could mean, if you invoke it, that the police would inform your ex DIL if the BF has a history of DV, DA and presents a danger to her or your DGS.
Also, if you have concerns you could speak to Head Teacher who might be willing to pass them on to new school. As others have said, try to be nice to BF but he will see through that and knows you have seen through him and further cause to isolate DIL and DGS
I feel for you and your DGS
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