We tossed around a few options - phoning my parents had the issue of them taking over 2 hours to get here, longer if my mother was at work - and in the end I had the baby at midnight so we just left the toddler at home sleeping in bed, blissfully unaware of what was happening. The other half was back home within 3 hours, neither child (the older one is 9) woke up. My parents turned up the next morning.

Probably not the best option, but considering I had the baby within 1/2 hour of getting to the hospital if we'd woken the other kids up, got them organised, packed them in the car etc I would have either had the baby in the car in subzero temperatures (I live about 2 mins from the hospital) or in the house while nagging DD#1 to put her clothes on.