Describing a "New" relationship

In Act 2, scene v, Posthumus redefines the notion of family and commitment. He cries, "We are bastards all," (2) and lists the faults of women. According to this soliloquy, then, no one has any real familial relations and partnerships are bound to fail. As such, is this play about the boundaries of family and kin being left too vague. The Queen dies at the end because she violated the "rules" of family and confessed, feeling bound to do so by those "rules." Consequently, where are the boundaries of family in the play?