Hey trappeddad;
Sigh... I just SMH sometimes at the wacky stuff we have to deal with. Glad you can be here to talk about it.
Echoing LnL's question, how do you think your S views this? Is he the "if Mom says it, then Mom is right and I'll defend it" kind of kid? Or if you said something like "Eh, we don't have to do that here, buddy", would he be accepting?
Thinking about responses reminded me of something Dr. Craig Childress wrote about emotional tone. I'd encourage you to check out pages 14-16 of this article:
www.drcachildress.org/asp/admin/getFile.asp?RID=63&TID=6&FN=pdf (it doesn't copy/paste very well, so I'll try to sum it up here for those tracking this thread)
Basically, happiness/laughter are socially bonding. Also, being able to stay at an "emotional tone" level of 1-2 (versus a 10, something like explosive anger), actually signals that you, the adult, are in control. When we're able to lovingly, with warmth and bemusement, use "dismissive surprise" to invalidate (in a good way, this time) any wild accusations coming from our kids, that can be really powerful.
So, if someone's kid is in this circumstance ("Mom says I have to wear the watch here and you hate her and don't want me to, even though I want to"), instead of taking the bait and raising the emotional tone of the interaction, some parents have success in keeping the tone at that 1-2, where it's on the level of "Oh? Yeah, that sounds like Mom. Well, I haven't lost you yet, here, but we can sure try!" kind of stuff.
Interested in hearing more from you, trappeddad!