Was Louis the oldest son of Carlos and Letizia Buonaparte?
Yes
No, he was the youngest
No, he had an older brother
No, he was in the middle of his siblings
Answer
No, Louis was not the oldest son of Carlos and Letizia Buonaparte. He had an older brother, Francisco, who was born in 1981. Francisco is a prince of Spain and is the heir to the throne after his father, King Felipe VI.
From Emperor to King: Unraveling Louis Bonaparte's Reign