Gonna have to disagree with you there. The "sisters and daughters" rhetoric is used partially because it drives home the idea that rape, sexual assault, and abuse against women are not far-away issues; they are things that can affect the people closest to you.
And this may make me unpopular among my fellow feminists, but I don't have much of a problem with women being talked about in the context of familial relationships, as long as it's equally done with men. The relationships we form are an important part of who we are. Sure, I'm a sales broker/college graduate/protestant/gamer/globetrotter, but more important, I'm a brother, a friend, a father, a husband, and a son. Those are the five most important identities I hold, because they refer to the people who make me who I am.