Need advice

Do the parents of the only child know this is going on too?

Ok yeah i understand. Ultimately we can’t control others. I think it’s key to teach children all we can control is ourselves and having boundaries is so important and healthy. Maybe you and your children can role play scenarios and not to call out the other child or to talk about them behind their back. But start with scenarios that are not this one and then add this one in. Help them create sentences they can say that make themselves, your children, feel safe. Example: right now it’s my turn, but when I’m done it will be your turn. Remind your kiddos that someone else crying is how that person expresses their feelings. But we don’t have to change our boundary just because someone is upset. And remind your kids that’s of course if they aren’t sure if their boundary is safe they can always come to you! They can practice by saying; “Mommy, when I told them they couldn’t have a bite of my snack they got mad at me. Should I have given them some of my snack?”

Those are just my thoughts!!