Aruba is definitely a family island. Aruba does not even offer any advertised "couples only" resorts. Admittedly, there is one resort which has an "adult only" tower and a resort which is "adult only", but this is far from the norm.
Most resorts offer Kids Clubs and those which do, some are free of charge.
All of the resorts in Aruba offer fresh water swimming pools. The Hyatt & La Cabana have waterslides. The Radisson, Holiday Inn & Playa Linda offer zero entry pools.
My favorite picks for things to do with kids are:
Butterfly Farm
Donkey Sanctuary
Aruba Ostrich Farm
Snorkeling at Boca Catalina
For more info see the official Aruba Tourism Authority website and their Aruba Family Experience E-Brochure