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Toph said..jev7337 said..
But all that matters is having a yacht - a seaworthy yacht - in the first place and getting out there.
And I totally agree....... To a point. If it was just me single handed, I would. As long as it was safe....
However I have a young family and I enjoy boating with them, and at the moment they enjoy boating with me. But my wife enjoys boating because of the family time it offers. She personally couldn't care less about boats of any kind. So if I am going to ask them to spend six months on a boat, away from friends and family, ask her to home school the kids, take the kids away from a season of their beloved footy, the least I can do is ensure they are not only safe, but comfortable as well to enjoy the experience as much as possible...
Just my opinion
OK, I've already declared my cat bias but, IMO, a 35' to 40' cat is an excellent way to get the space you'll need for extended living aboard with your family.
I say this because you'll probably want a separate cabin for each of the kids, plus a cabin for you and your wife, so 3 cabins. Plus the kids are going to be doing school work on the boat so they'll need space to spread out, even in inclement weather. Many cats have additional workspaces down in the hulls, in addition to the extensive saloon area. Having an extra head is really nice too when you're living in close confinement; many cats have one head per hull, even if there is only one full bathroom.
Also, there's no reason why a cat of that size cannot be sailed completely single handed, i.e., by you, if the rest of family is busy

To get comparable space in a mono probably means a vessel that is at least 10' longer.