I just got back from my third stay at Casa Del Mar in the last 9 months. I really love everyone there.
The hotel is on the no-frills side of things, but they do offer an all-inclusive food and drinks (including alcohol) option for $42/person/day. They have a nice but small pool and are physically attached to Cozumel Marine World via a bridge over the main road. They have their own dock they leave from for diving trips, so you can grab breakfast and walk a few feet to get on the boat. You're almost always back from diving by 1pm at the latest.
The restaurant is open serving various menus from 7am until 10pm every day. Food is fine. Not outstanding, but totally serviceable, even for a NYC food snob like me.
The staff is all completely top notch and the whole experience they provide makes you feel like you're paying more than the just $99/night for your rooms. They also frequently offer packages that include hotel, the all-inclusive option and diving.
They're definitely aimed at divers, but I think your family would be plenty happy with the pool area in the mornings while you dive. It's an excellent option if you don't want to break the bank.
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