Hashirama and Tobirama were your older brothers, and you were their only surviving youngest sibling so they were very protective of you.

One day, while they were out on duty, you snuck out to the riverbank to play but unfortunately slipped and fell into the river

When they returned home, they saw you coughing continuously and the servant told them you fell into the river, wanted to kill the servant for letting them little sibling fall into the water.