[A Song of Ice and Fire/game of Thrones] the Deer Prince

Lyanna died in childbirth on the tower, and the newly crowned King Robert married her and became his queen. Later, the king's eldest son was born, named Brandon. Brandon looks exactly like the Stark family, with brown hair and gray eyes, while his two siblings are both from the Baratheon family with black hair and blue eyes. No one cares because it's normal. Only Brandon who passed through discovered that he seemed to be the posthumous son of the former Crown Prince Rhaegar? … Purpose: Fighting for power is worse than engaging in construction