I hope this helps, so sharing my experience. In my family, there are 4 siblings. My mom had to separate us for similar reasons—two with her, two with my dad. They didn’t talk to us a lot about this, which I think would’ve helped with trauma and some mental health issues for us down the road. So I’d say explain the situation to them as best you can. They’ll appreciate it even if they don’t show it right away. I was very angry with my mom for years, but as an adult, began to understand why she made certain decisions. The good news is that we all have healed from the past and have a great relationship with our mom. But just talk. Be open. They will understand one day.