"I think that's a very, very important thing to do because it's the only way change happens," said Savannah Bonboster.
In October 2021, Sergio was stabbed and killed by his roommate's 17-year-old girlfriend.
The roommate, Lawrence Madrid, helped mutilate his body and dump it in the canal near Hughes and Norwich in northwest Fresno.
RELATED: Gruesome details revealed in preliminary hearing for man, girlfriend accused of murdering roommate
To this day, family and friends maintain a memorial where Sergio's body was found.
"They're out there, just sitting out there because that's the only place people feel connected to him sometimes," said Savannah.
Madrid was sentenced to the maximum sentence of just under four years in 2023, but has since been released.
The 17-year-old was convicted of murder, but is already out on probation because of Proposition 57, which focuses on rehabilitation.
She was released from custody late last month, but the District Attorney's Office confirmed she remains on probation.
The probation department couldn't confirm the details of those restrictions because she was convicted as a minor.
In the August hearing, Sergio's sister, Savannah Bonboster, learned the woman was already attending college and will now be able to attend in person.
"It was another reality check as to the opportunities that she's been given without any kind of consideration toward what she's done," said Savannah.
Savannah and the rest of their family have accepted that the sentences won't change in Sergio's case, but they hope to make a change for other victims' families in the future.
Through it all, Sergio's younger brother, Sabastian, focuses on the time they had together and living to make his brother proud.
"What he would say right now is just that he loves us all, he's proud that we're all doing this as a unit, we're staying together and together, we're stronger than one person alone," said Sabastian.
The family isn't alone in their fight; they stood alongside other families and District Attorney Lisa Smittcamp at a protest last week.
For news updates, follow Kate Nemarich on Facebook, Twitter and Instagram.