If you’re in Tier Two, you can’t have anyone who’s not from your household inside your house, unless you are in a bubble with them. I might be wrong but I understood that only a single person can be in a bubble with another household, although the single person may have children. So if your adult child is married or living with someone, I don’t think you can form a bubble with them, even for childcare purposes. It seems to me to be yet another ill thought through thing, because if parents work what are they supposed to do with their children in school holidays? We look after our grandchildren three days a week in school holidays, and we look after the three year old one day every week, but we’re in Tier One, so the rule of six applies to us.
Is there such a thing as ‘childcare bubbles’? Sorry to be not much help, but I’ve never heard of them, except in Northern Ireland, where it was explicitly explained that childcare was exempt from the lockdown they’re in at the moment. Obviously, if you live in Northern Ireland childcare is allowed, but I suspect you’re not.