Question: is tywin really tyrion's father?
Answer: He's a Secret Targaryen The hypothesis goes like this: Tywin wasn't Tyrion's father, and he's actually the child of Joanna Lannister and the Mad King Aerys Targaryen. Before before she died giving birth to Tyrion, Joanna lived at King's Landing and served as a lady-in-waiting to Aeryrs' sister/queen, Rhaella.