Sean Kaden

Sean Kaden is the father of Justin Kaden, the husband of Anita Rosemary, a pediatrician, a teacher, and a skilled hand-to-hand combatant. He and his son are Muslim, like Layla. He is the trainer of Layla and Esme (though Esme is also trained by her karate sensei) and is in his late-forties at the start of the series. However, he is noted to look like he is in his 30s.

Etymology
Sean means 'gift from God'. It is noted that Sean is a very skilled hand-to-hand combatant and is very useful to the protection of the secret library.

Kaden means 'friend'. Sean is quite friendly with everyone, as is his son, Justin.