One of the more interesting things about vampires are the families they form and the dynamics within that family. When I first read this post my first thought was that Janette from "Forever Knight" wasn't a passive person; for the most part her angst free attitude towards vampirism served as a direct contrast to Nick's. Like Darla, Janette had been a prostitute as a mortal and becoming a vampire for her was a liberation; she couldn't relate at all to Nick's quest to become human or his hatred for Lacroix. All this was changed of course on her farewell where she unintentionally became human due in part to having fallen in love with one. Before this Janette's role in the family seemed to be that of the well-adjusted older child who kept out of the fights between her brother and father; if that's what you meant as passive than I agree.

The Fanged Four are uniqe not just for having female sires but also for being multigenerational; the other two examples consist of a sire and his fledgelings. The only relationship in their group that's not really defined is Spike and Darla; near as I can figure she mostly saw him as her granddaughter's boyfriend.