I have a Prospecteur Sport and like it as an all around canoe, with a bias toward rivers. The Canyon is a whitewater tripper, and I think you would be disappointed using it as an all around family boat.
If you are really planning to carry the entire family, including the 80 lb dog, definitely go with a 17 footer. I'm not familiar with the Concord, but just from a glance online it looks like a nice boat.
On a trip, would you put two paddlers in the Concord and two in whatever Esquif? That would give more load capacity, better handling boats, and provide the kids with something to do.
OTOH, I firmly believe that his-n-hers canoes are the key to a happy marriage. The corollary is that teenagers also need solo canoes. So you could paddle a big canoe solo, and get 3 Esquif Echoes, for mom and both kids.....if money is no object.....
Be forewarned that there are a lot of enablers on this forum who will encourage canoe addiction.