Not for Us
This might be a cute movie for a small child from 3-5 yrs. I have a 9 yr old son that I watched this with. It's not a hit movie, just a summer movie filler.
Downside for me: Luca blatantly disobeys his parents and goes above water day after day where they believe it is unsafe for a mermaid. When they find out and want to send him to live with his wayward uncle deep in the sea, he runs away to land. There he continues to build a friendship with an older mermaid/boy who has chosen to live on land all the time. We can assume he's around 17-18 yrs since he says his father has decided he's old enough to live on his own and has abandoned him in a sort of lighthouse/castle. Luca is portrayed as about 11. It's a questionable relationship. They go on in the movie to sleep on a treehouse platform together outside a new friend's (human) window.
High points: They all practice perseverance, grit and determination to win a race in order to receive the prize scooter. (be it.... all while Luca is out running his parents at every turn and knows it). The music is good/different for children to hear. In the end, there is an important message about the desire to learn and go to school.