I got into riding after Jnr was born as we couldn't afford gym fees/the time.
Jeez, we were both so naive.....several bikes, thousands of pounds, and days away later.....
That said, she knows if I don't ride, I get cranky, and she'll send me out for a ride. When we go away, I'll take the bike and maybe have a half day at a trail centre and another half day pootling while she has the kids. We've planned holidays around places that can cope with biking and young kids. (And would recommend Dumfries and Galloway to anyone!)
She moans about the washing from daily commuting, but accepts that the flip side is we save £100 per month on petrol/car costs.
I'm reasonable in my expetations - we can't afford for me to go away for weekends with mates regularly, so I don't do it.
And it works both ways - if she wants a day/weekend away, she knows I can't refuse, and I get some proper time with the kids while they are small, which is lovely. They really enjoy helping daddy wash bikes or helping fix punctures
That said, our calendar is pretty full for months in advance as it takes a fair bit of planning to fit in planned rides/events, kids parties and activities and friends and family. Being married to an organisational genius who could have planned the D-Day landings in an evening certainly helps