Why does Tywin Lannister keep Sansa Stark alive and wed to Tyrion Lannister after hearing that Robb Stark (and his mother) has died?
"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?"