Poor kid, how sad to feel in the middle like this.
I don't know situation obviously but can't they come to an agreement such as 50:50 access or something? It must be awful for them going for an access weekend and parent saying, no you aren't going home you are staying here with me. How upsetting and unsettling for them.
Why are the parents doing this? Do they genuinely believe the other is a bad parent? Want to get even/upset the other? Can'tbear being apart from dcs?
They need to come to some sort of solution that's for sure.