Excitement at seeing relatives he doesn't see often, plus your/DH stress (especially the extra stress of knowing how he reacted the last time....) sounds like a perfect cause. Do they react and escalate it?
I think we'd be completely sorted with potty training if DH didn't insist on putting A in a nappy whenever he's got him alone
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I sit him on the toilet before I go out and he'll happily do the drive to school, drop DD off and then go off to preschool with no issues whatsoever. DH puts him in a pull up because he "doesn't have the time to deal with it if he has an accident". While I would just drop A off and either change him there or ask staff if they could help him, when he had an accident months ago DH changed him at the car, made DD late for school and just can't handle it.
It's just so confusing for A. I'll have to lock the things away and let 1 nappy out each evening!!
I think our school is about to crack down on absence and holidays. Just from illness this year DD is less that 1% better than 1/2 a day off every week.