So this idea is inspired by this post headcanon on Tumblr. I'm also going. To add a few things and out in a twist.
I hope you all enjoy.
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Hera, Kanan and there 7 year son Caleb, were walking around the streets of Lothal. "So what are we getting again" Caleb asked. "We are here to get power converters for things" Hera replied. "And don't forget the supplies" Kanan added.

"And the supplies. We are here to get power converters and supplies" Hera explained. "Can I go look for something really quickly" the young boy asked. "Sure thing. Just stay out of trouble and if you run into a trooper, walk away okay" Hera told Caleb.

"I'll do that. I'll be back in a minute" Caleb said as he ran off. "Okay let's get going" Kanan told Hera as they walked down the street.

Meanwhile, Caleb ran down an alley way and bumped into someone. He fell to the ground. "Hey watch where you're going" Caleb herd someone say to him. He looked up to see a boy, around his age, sitting on the ground rubbing his head.

"I'm sorry, I didn't see you there" Caleb apologized. "Well that isn't a excuse" the boy said with anger. Caleb stood up and helped the other boy up. "I said I'm sorry. My name is Caleb by the way" he told him as he held out a hand for the stranger to shack.

The boy was hesatent​ at first but shook his hand. "I'm Ezr-" the boy started but was interupted by someone. "Stop there street rat". They both turned to see a trooper. "Got to go. Sorry" the boy said as he pushed Caleb and ran out of the alleyway.

Caleb got up only to see a blaster pointed right at his face. He looked up to see the ragged trooper. "What are you doing here. This is a restricted area" the trooper told him. "I'm sorry. I didn't know" Caleb explained.

"That's no excuse. And for that, you will be turminated" the trooper said as he pulled the trigger, blasting the boy.

Meanwhile, Kanan and Hera walked around untill Kanan stopped. "Kanan, what's wrong?" Hera asked him. He was silent at first. "Hera we need to find Caleb" Kanan told her with worry.

Fear filled the two as they ran back down the street where they last seen their son. Suddenly the herd a scream and a blaster firering.

Kanan and Hera ran into the alleyway where they noise came from and where horrified by what they say.

A trooper with his gun, and their soon on the ground, blood all over his forehead. "CALEB" Hera yelled as she ran to her son. Kanan was filled with anger. He took out his blaster and shot the trooper, five time's in the chest.

He turned to see Hera cradling the dieing son in her arm's. "Caleb please. Please don't..Please don't leave us" Hera cried to her son. Caleb only cried from the fain that filled him, blood covering his vision from it spilling down his face.

Kanan ran over to them and held the kid's hand. "I..I'm..I'm sorry... I'm sorry" Caleb told his parent's. "No Caleb you did noting wrong" Kanan reassured him. "I..I.. I'll mi.. miss you..." Caleb told his parents as he passed.

"Caleb. Caleb. No no no Caleb please don't...Please don't do this..please" Hera cried as she hugged him. "Hera... He's gone" Kanan said sadly. They stayed there for what felt like forever, mourning their son.
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I hope you all enjoyed this chapter. I am going to do a part 2 on this and I will do part 3 of Brother's soon.