It happened to my daughter too. Make a police report. Let the court decide about parenting time and custody. It’s been 5 years since this happened. My daughter gets therapy but it has affected the entire family. Outbursts, mood swings, personality change. My other kids ended up needing therapy also. And so did I to be a supportive mom. This ALREADY affected your son. Don’t make it worse with having your daughter and son continue to see the perp in thier lives. Protect them.
I hope your reported him,too get justice for your daughter, please don’t let him see your son what if he would do something to him next better to be safe then sorry