Best ABC island for a group of adults and one 2.5 yr old?

My in laws are planning a trip for them, two couples, and a 2 year old. We will be going in September, and I’m looking for info on which island of the ABCs would be best/family friendly? First looking at all inclusive options but we are all very go out and do kind of people so not opposed to staying in an Airbnb on an island either as long as it’s in a safe area. Looking for info on which all inclusives are best for kids but still high end. Pros and cons to all islands traveling in a group like this? What are things I should consider as I research?