Well, that's a unique, blended family. He's not sure what that means; are they all in some kind of...polyamorous relationship? Did one mom divorce the dad, and they got remarried? Was he adopted? There are a few possible scenarios here, but in the end, it doesn't matter much. The kid has people here looking out for him.

"Your family's got you, but if anything happens, you can come to me, okay?" He's a cop, that's in his blood.