I've rented both toons and a deck boat. The 18' deck boat had significant room compared to a similar size runabout. The similar size toon seemed cumbersome by comparison, although it certainly had an open feeling.
Sea Doo makes a 22' jet deck boat (Islandia) that seems to cover all the bases, including a changing room/head under the helm and a toddler fountain play pool in the bow. Swim ladders at both ends.
https://www.boats.com/reviews/island-of-possibilities/
Now is the time to start talking to dealers to see if they will comp some tickets to the NE Boat show. (BTW Different dates this year.)