So, our second sprog is now 8 weeks old, and along with our 2 and a half yr old, they're obviously rather a handful. With the birth of the first, my riding time took quite a hit, even more so when we had the second. However, having climbed the walls for quite some time now, my wife & I have decided to negotiate regular time off so we can do our own thing (wife - horses, me - bikes). We each get one evening off (I take mine for my LBS' regular weekly evening ride), and alternate Saturdays off. Considering I work full time, this does mean we only get Sundays together as a family, but because I mainly work from home I still get to see the kids a lot so that's ok with me, and worth it because I'm frankly very hard to live with if I'm not getting regular rides (arf!).
Strangely though, a lot of our friends/family seem to think this is a rather odd setup & we should give up our lives to stay at home with the children or something, which always seemed counter-productive to me. Happy parents are good parents, or so I like to say.
Anyway, we kind of struggled to get to a position there this all works fairly well. I'd be interested in how other couples with children balance their responsibilities with their hobbies. Cheers.