"But you answered. With that interesting reveal," Felix pointed out, tilted to the side. "Why share with me?" The enemy was implied, but not spoken.
Imprinting was a new word for Felix. The masters, Aro especially, probably knew about it when he touched the child two years ago, but Felix hadn't heard that word before in this context. But he had been told that one of the mutts was bonded to the child, hence the family comment. It sickened him to his stomach that any sane vampire would allow it to happen.