qqp question1: Why does Tywin Lannister keep Sansa Stark alive and wed to Tyrion Lannister after hearing that Robb Stark (and his mother) has died? question2: "Did Cersei Lannister turn Jeyne Poole into ""Arya Stark"" on her own accord or did Petyr Baelish suggest it with the forsight that he could reveal she was a fake so Sansa could inherit Winterfell?"