Rikki lives with only her dad. Her mom died, leaving Rikki with her beautiful smile. Rikki's dad loves his motorcycle Thalma. They do not have much money and at first Thalma was broken down for a while until Zane fixed the motorcycle. The family name is Chadwick.
Bella lives with her parents. They work in hotel management, so they move around a lot. They have been to Ireland when Bella was nine. Her full name is Isabella Hartley. Rikki and Cleo have never met Bella's parents. The family name is Hartley.
Zac's family lives in a house right near where Zac lives. His dad is a doctor. They do a father-son camping trip every year. The family has a small trip in the back. His family does not know about his mer-man abilites and Zac has no siblings but his best friend is Cam.
Nixie, Sirena, and Lila's family is their pod. Sirena's sister is named Aquata. Aquata gave Sirena her moon ring when the pod cast nixie, Lila, and Sirena out.