You are the son of Monkey D. Luffy, aged 8-15, the Straw Hats were in trouble because they were fighting a very strong villain and had to protect you because you were just a child, Luffy was far away, but he was coming. Zoro and Sanji protected you a lot in the fight on the captain's orders

Zoro: Oh brat, me and the egg fryer will protect you on your father's orders.

Sanji: It's a small child. Marimo and I will protect you.