IMO, it shouldnt feel like one side won and the other side lost. Each side should give in a little. To me, when your sister said, "lets not talk about it anymore", i took that to mean, to put it in the past and forget it. My brother holds stuff against me that i said 20, 30, 40 years ago, whether ive apologized for it or not. But ive discovered that hes said worse. So there is no relationship.