Can I suggest a Sundeck design? Based on your wife's interest in having shade (which I totally understand), a Sundeck with a hardtop over the deck will offer a lot of comfortable outdoor real estate. A Bimini cover on the flybridge offers additional shade. You will have a full width master cabin for you and mom and a front cabin for the little ones or guests.
One of the downsides is the numerous steps. bSteps up to the flybridge. Steps down to the saloon. More steps possibly to a down galley and front cabin. Another is additional windage inherent with this design. Not a big deal, but something to be aware of. Every type of vessel has strengths and weaknesses, but for us it has been a good fit. Good luck in your search!
Present 42 Sundeck
Steve Point Cadet/ Biloxi, Mississippi USA
*Present 42 twin 135 Lehmans