Most families coordinating care for an older parent end up with one of two problems. Either the main family WhatsApp bloats with logistics — rotas, GP appointments, who's doing the shopping — until nobody can find the photo of the grandchildren anymore. Or a side-thread starts up "just the kids" that quietly excludes a partner or the carer who would actually have been useful in it.
The Family room is the small calm place in the middle. It lives next to the daily check-in and the shared visit calendar, not next to the holiday-photo thread. Everyone in the Circle is in it — the siblings, partners, the carer if they've been invited. Nobody who shouldn't be there is in it — most importantly, Mum.
It's the same conversation you were already having. Just in a place where you can find it again next Tuesday.