From SuspireWiki

The condition of pure lineage, though the definition of “pure” varies from domain to domain. Generally, a line of Kindred in which all members are Invictus can be said to be blooded. Likewise, a Kindred is said to be “blooded with” or “blooded to” other members of her same bloodline.

Usage: Careful what you say: she’s blooded to the Prince. or Prior to his Embrace, theirs was a blooded line.