that usually comes up regarding solo seat placement is to put the leading edge of the seat about 4 inches aft of the center of the boat.
I routinely solo a Penobscot from the front seat facing aft with a bit of ballast in the "new" bow. If just you and the five year old go out the boat would be pretty well trimmed with her in the rear seat. With three in the boat you could put your daughter on the deck on a couple of boat cushions or buy a drop-in seat for her.
Full Size Sail Rig
Paddler's Truck Rack
Bent Shaft Canoe Paddles
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