How does Jack feel about Harry being a Rider, and how does Harry find out about her heritage?

Jack is impressed that she is a Rider, and he notes that blood must run to blood. Jack explains, when questioned, that Harry's great-grandmother was a Hill woman of high rank. Senay and Terim note they have always known this, but Harry was never told of her history, even though Richard, her brother, knows. Harry begins to understand why she has been placed as a bridge between these cultures.