Child Custody

How to file a court order for sole custody for kids to travel without their dad. Me and the father broke up in 2022 because he had an affair, as per his confession. I left to go to Canada in 2023. I met someone in 2024 and am currently in a relationship. Ex started to come back and is now threatening to take the kids away from me, even though he knows that I already applied for permanent residency here. He is threatening to deport me, because I believe he knows about my relationship. He didn't bother years ago, but just now he is trying to make me miserable and threatening that he wants all of us to suffer, stating "damay damay na toh". He is threatening my teen daughter. My daughter is scared to be taken away.