Vampires, at least in Jack's most immediate experience, don't do much to take care of each other. There are some who do. He's seen it from a distance. He and his sister would definitely do what they can to protect each other (and Michelle is always the first to call him out when he's being callous and unfeeling). Other than that? Their parents see them more as pieces on the chessboard, tools to spread their influence.

"I'm honestly not sure what vampires do to take care of each other," he sighs. "We'll find out together, won't we?"