AnnJH, how sad for you all, Christmas Day or any other day to be fair.
I really feel for today’s young parents. They’re told at every corner, what to do and when, right from the start....so birth of their babies.
I think the discipline side is the hardest hit, ( no pun intended). The anti smacking stances over the years have put a one off correctional slap, in the same category as abuse, and confused everyone.
I smacked my children very rarely, and it was always a last resort, on the back of the hand or leg. For me, it always worked, and the children didn’t repeat the offence. Mostly...the death stare was enough. They don’t remember being smacked much at all...which they weren’t. We had a brilliant, fun, family life, which I now think they’re trying to emulate with their own children, except they have the ‘ baby police ‘ watching.
One of my sons and DIL have never smacked, which is fine, but there’s no firmness in their discipline, it’s just about negotiation. This is fine from about 4 years old, as long as the discipline was there before. If it wasn’t, it’s hopeless, as they’re now finding. Family life is not always what they thought it would be. I’m worried one day....someone will ‘lose it’, as it sounds with your SIL. Apart from sounding too harsh, being hit across the back, a firm word is all that should be needed at five years old.
It is really difficult, your instinct was to cuddle your granddaughter, but unless you feel it is bordering on actual abuse, or it’s one of many times, I really wouldn’t get involved. They must be left to parent as they see fit.
All the best.