I checked out house boating in Australia, New Zealand, and even Canada. Canada because when we were travelling in Canada in late 2012, we passed by Shuswap, British Columbia, which claims to be "the house boating capital".

And I have a few options.
The simplest option was just to travel with the wife and kid. Three of us on a cosy little houseboat for 4 to 6.
Another option was to bring my in-laws and maybe my mom. This would mean a slightly larger houseboat, and likely would be more expensive. And I would have to bear the travel costs for some or all of them.
And recently, I had another idea. More on that later.
But it's 2018 and I haven't gone house boating yet.