I'll second the suggestion of Ambassador Divers (ambassadordivers.com). Our family has been diving with Jason since 2003, when parents first went to the Caymans. He won us over when my parents insisted we all visit that winter, our first family dive trip and I suspect we were a trying bunch of customers - my brother a non diver, my husband newly certified, me, a nervous extremely rusty diver. My parents, newly passionate about diving, but not all that experienced. Mix in typical family dynamics ... he handled us all with aplomb, reassuring us, keeping us safe but relaxed. And making sure we had an amazing time.
On that trip he certified my brother, and since then my parents and husband and I have done advanced OW certs with him. We've returned yearly since then, and it's most often just our family of 5 on his boat, sometimes another person or two during the high season. Now it feels like our really experienced friend is taking us out on a personal trip on his boat - we're totally spoiled!