I've refrained from SXSW pimping on HN, but since it's directly relevant to your question here ... I have a panel proposed for 2011 on The Life of the Startup Parent, here: http://panelpicker.sxsw.com/ideas/view/7715.
We'll be looking at questions like "How do you balance your role as a parent with your role as a co-founder? How do you reconcile these two worlds, each of which would happily consume you completely? How much do you rely on your (life) partner? Your (business) partners?" and so forth.
I'm doing it now... NewBaby Inc is killing my other startup. If you thought sleep deprivation when coding is hard work, try balancing that with a screaming, shitting, attention-grabbing bite-sized human and see how you get on.
probably because of the slow start from bootstrapping followed by faster growth recently, my 5 year old business feels like a startup. My daughter was born in March. It definitely changed my work pattern but I'm still coping ok so far. I commented about my new schedule on this post:
http://news.ycombinator.com/item?id=1597627
Our last child was born during our start-up. I had to learn to compartmentalize. Your wife will need your help, and that usually means a solid focus as opposed to a I'll-listen-to-you-while-I-tap-away-on-my-smartphone kind of focus.
My schedule has remained the same since: I make breakfast for my family almost everyday, and I block out 5:30-8:30 every night for the kids, and 8:30-10:00 for me and the wife. After she goes down I get back to work and plug away until around 1 or so.
So far so good. No divorce papers have been served yet. :)