I have to be honest with you, I don't know for sure what "sailtime" is. But if it's one of those timeshare boat club arrangements, I have to say I'm not particularly keen on them for family sailing. At one point we considered similar offerings in our area, but after reflecting how we use our boat we realized it wouldn't be a good fit for us.
As you know, when sailing with kids there are a lot of concessions that have to be made with respect to safety and comfort. We concluded that we needed to be able to set-up our boat in whatever way we deemed fit to accommodate our kids, including safety features and gear (toys, games, dinghies, kayaks, etc). We wouldn't have been able to do that in a time-share arrangement, or if we could have it would have meant schlepping heaps of stuff back and forth for each sail. Equals= not much sailing.
Just something to think about.