STOCKTON — A family mourning the loss of three members gunned down on Mother’s Day is imploring anyone with information to contact authorities.

“In an instant, we lost three beautiful, innocent lives,” Cheng Lor, brother of Joe C. Lor, said in between sobs Thursday. “It’s been extremely difficult for the family to comprehend how someone so heartless and cruel (would go about) murdering an entire family.

“We’re asking for your help for some answers to the millions of questions we have. If you know anything, just anything, even if you think it’s very insignificant, please reach out to the Stockton Police Department.”

Joe C. Lor and Gina Xiong, both 22 of Stockton, and their daughter, 5-year-old Kayleen Lor, were gunned down after someone opened fire at a home about 10:15 p.m. on Sunday in the 1600 block of 11th Street in the Sierra Vista Homes neighborhood. Two men were also injured in the shooting but survived.

Stockton police said the family was celebrating Mother’s Day.

Police announced Thursday that Stockton Crime Stoppers is offering a cash reward of $30,000 for any information that leads to an arrest in the triple homicide. Police Chief Eric Jones said this is the largest reward offered to date.

This case is a top priority for the department and detectives need the public’s assistance to find the “perpetrator or perpetrators who committed this heinous act,” he said.

“At this point, our homicide investigators have no motives or active leads in this case,” Jones said during a news conference Thursday. “We want to know why this home and this family was targeted.”

Xai Yang clutched a photograph of her granddaughter Kaylee dressed as a police officer as Jones said detectives are working with family members, neighbors, the Hmong community and the community at large to determine what happened the day of the shooting.

“We don’t have the leads that we would like at this point,” he said. 

Aside from saying that dozens of shots were fired at the home, Jones said the department was not ready to release details of the investigation at this time.

San Joaquin County District Attorney Tori Verber Salazar had an earnest message for people who may be withholding information:

“If you know something and you’re allowing these individuals to walk amongst our community after violently taking the life of a 5-year-old child, what does that say about you and what is your role on what happened on that day?”

Verber Salazar said no amount of information is too small or insignificant to help solve the senseless crime that took the lives of a child and two young adults so violently.

“There’s 745,000 of us residing in this county; we must come together and we must take a stand,” she said. “Together we can solve this crime.”

She asked for people to think about what they were doing on that day, what they saw, what they heard, and tell Stockton police. The information may not seem significant, but it may be critical to the investigation, she added.

“We know someone out there has information on this case,” Jones said. “Please do the right thing.”

Said Cheng Lor: “Our lives will never be the same, but you can help ease some of that pain and help bring justice to Joe, Gina and Kayleen.”

People can contact Stockton Crime Stoppers at (209) 946-0600 or submit a tip on the Stockton Police Department Facebook page, or the free mobile phone app. Callers can remain anonymous.

Contact reporter Almendra Carpizo at (209) 546-8264 or Follow her on Twitter @AlmendraCarpizo.