| Quote #1
Richard's first mention of his relation to his family prepares us for the way family will function in the play. Richard speaks of deceiving one brother to imprison the other. He even explicitly compares himself to his brother Edward, saying that he is all the evil that Edward is not. Thus we get the hint that family will not be about the ties and the love that bind people. Instead, it's just one more instrument Richard will use to manipulate and spread his hate.
| Quote #2
Richard implicitly draws a comparison between himself and Anne's dead husband, the murdered Prince Edward, by pointing out their old family connection. By invoking the Plantagenet name, Richard goes far back to the original family from which the two warring houses, Lancaster and York, sprang. Amidst all the animosity in the play, it's easy to forget that the warring Lancasters and Yorks are actually related by blood (hence the dispute). Remembering the family connection between the Lancasters and Yorks also makes all the quarreling within the York family a bit more understandable. Being family doesn't guarantee allegiance. Fighting within the family is common, hence the Wars of the Roses.
| Quote #3
Margaret represents the old guard that the Yorks defeated to come to power. As they turn from their in-fighting to attack her, we get a rare glimpse of family loyalty and unity amongst those related to King Edward.