As the resident Xtracycle owner, I have ferried >50kg of girlfriend on the back, and the length of the edgerunner is more than ample for three little people. Their insta is full of such photos.
They are also really really hawking their electric ones at the moment.
I have 3 kids so Bullitt is out, which is a real shame as I love the way they look. And superb for odd shaped cargo
I've not seen two kids on a Bullitt, only 1 or 1+another small one. My older two are nearly 8 and 7
Mind you, with those two on my Big Dummy there isn't really much load carrying room anyway I suppose!