Our son is using custody schedule as a threat
He's 11. When he doesn't get his way with either of us, he threatens to ask the judge to let him live with the other parent. Obviously he has no idea how that actually works, but it's become a manipulation tactic. My ex and I actually talked about this (surprisingly productive conversation) and we're thinking of a united front approach—like both telling him the schedule stays the same no matter what and that threats won't change anything. But how do I do that without making him feel like we don't want him or that I'm being cold? This is hard.
Yeah he's learned that's a power move. The 'I'll tell the judge' threat is basically his nuclear option and he's testing whether it works. Classic negotiation tactic for an 11yo.
The fact that he's doing this at both houses means it's working at least some of the time. He wouldn't keep using a threat that had zero effect. Something he's getting out of it—whether it's your reaction or actually getting his way sometimes.