Thank you again for your advice! And believe me, Gill, we have everything crossed in this house! This is so stressful. Tells me yet again that back yard breeders of all animals have no soul, I'm worrying myself stupid.
Not sure where I'll find a dog cage but will give it a go. We don't know any dog owners. I am, however, pretty certain she'll give birth in my bedroom here, since she seems to see it as hers. I can but hope, right? Will see if there's an alternative to the cage if necessary.
I'll keep Brian separate, then. I had planned on doing this since I prefer to be safe than sorry, but it's good to have that confirmed.
The matter of moving them remains. How old can they be before we move house? Will it be very disruptive for them? I do plan to rehome the kittens (if I can bear to part with them - I may have to get my family to stage an intervention!) but that's months away and I don't want to unsettle either the mother or kittens unless totally necessary.