Jatai Had already become a Genin. Tetsuna was still in the Ninja Academy.
However, one day, after one of Jatai's missions, he decided to go pick up Tetsuna from school so their mother could rest at home and make the ramen with pork and eggs that Tetsuna and Jatai loved so much. Upon arriving at the house, the boys saw bloow spewing out of the main door.
Jatai:Tsuna, hide. I have to see what's going on.
Tetsuna:Ok big brother, I'll be in the usual hiding spot.
Jatai pulled out a kunai from his pouch and entered the house cautuosly. He saw a ninja from the Hidden Rain standing by his mother who was lying on the floor in a pool of blood. He stabbed the ninja in the back, and as he fell to his knees, Jataitook the Kunai out and stabbed the man in the back, throat, and head repeatedly.
Jatai:TSUNA!!! GET IN HERE, QUICK!!!
Jatai grabbed his mother and layed her on his lap.
Mother:My boys... You made it home safefly... Sorry I didn't get to finish the ramen...
Tetsuna and Jatai began to cry.
Jatai:Here Tsuna hold mom, I'm gonna go get some medical ninjas.
Tetsuna:*Sniff Sniff* O...kay...
Jatai raced to the hospital, but by the time he got back with some medical ninjas, it was too late.
Jatai And Tetsuna burried their mother the next day. that same day, Jatai pledged to become more powerful so he wouldn't let his otouto die.