After suffering through devastating losses and separations for the bulk of the series, the noble House Stark has finally returned and become one of the last remaining players in the ongoing power plays of Westeros. Not only have the surviving Stark children reunited at Winterfell, but one of them has been revealed to be a linchpin character in Westerosi history.
With her brother/cousin Jon Snow away negotiating with Daenerys, Sansa takes over as Lady of Winterfell, her rightful position as the eldest surviving child of Ned Stark (after her brother Bran declined leadership). Her younger siblings Arya and Bran return as well, much to her joy. Despite the attempts of Petyr Baelish to divide the sisters and rule through Sansa, Arya and Sansa team up to reveal his treachery and execute him for his crimes. Jon pledges loyalty to Daenerys and is rewarded with Ned's old title of Warden of the North.
House Stark's deceased members, however, have the biggest reveal. It is revealed that Jon is half-Stark, but not the way everyone thought: he is the son of Lyanna Stark and Rhaegar Targaryen. Thus, he is currently the unwitting true heir to the Iron Throne — and has fallen in love with his biological aunt, Rhaegar's much-younger sister Daenerys.