Two little ones
I've read allot about the regulations in Ontario Canada for sidecars and talked to a cop friend of mine. My interpretation of side car capacity is this. If the manufacturer built it and registered it with the CSA and DOT for 2 seating positions that is the maximum allowable occupancy for the vehicle. Regardless of modifications. So in theory using a Hannigan double in Canada doesn't allow you to have 3 people in / on the bike because it was never registered for it.
I hope your wife enjoys our close to home never ending travel.
As a side note. New baby means that I've been forced to finish my basement. Concequently the fab shop has been moved to the paint shop. Weld shop stayed where it was and paint shop may go to a good friends.
Don't buy the lifestyle out of a catalogue, live it!!!