I had both my girls home when I had Kara, and up until I really really really needed OH to do his birthing partner duties he dealt with them, between checking on me and MW and getting everything set up for me. Didn't have any choice in the matter as our babysitter ended up being in work, thankfully though my 10 yr old was in school as he is a nosey sod LOL
They had a TV set up in their room with their sofa, Rosa played with her toys, Mia watched some cartoon film about fish. As their room is open (with stairgate instead of door) they could be heard, also had the baby monitor set up so there was no chance of missing them. And it was quite sweet at times, they were happily playing together and you could hear them giggling together over the monitor and even while having quite big contraction (just before LO made her appearance in the world) it made me smile, mostly to myself but I'm sure I did crack a smile and if anyone could have seen my face I am sure they would have thought me barking mad.
Was lovely that once everything was done and dusted and I was sat up on our sofa having a cuddle with Kara he nipped back up to them and bought them to meet their new sister, though to be honest neither really cared a bit about it