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STOCKTON — A young family, including a 5-year-old girl, were gunned down while celebrating Mother’s Day with their loved ones.

Twenty-two-year-old parents Gina Xiong and Joe Lor and their daughter Kayleen were killed Sunday night in a home on 11th Street near Belleview Street.

Nancy Vue, Xiong’s sister, wrote on her Facebook page and addressed the killer.

“I want you to remember their faces and feel guilt… knowing you took their lives away,” she wrote.

Friends say Lor was a big presence in Stockton’s car scene and that many looked up to him.

Investigators say two men were also injured and are expected to survive.

“This type of case, the circumstances we are aware of are extremely rare, extremely heartbreaking,” said Stockton Police Chief Eric Jones.

Jones said solving this case is now their top priority.

“We want to solve this case. We want justice for the family,” Jones said.

The chief adds what’s especially heartbreaking was that this violence took place when the family was celebrating Mother’s Day. Neighbors, who say they heard gunshots around Sunday at 10 p.m., immediately heard screams then sobs.

“We heard her yelling on the corner last night,” said neighbor Samelle Brown. “We could hear them crying and it’s just sad.”

Police want to prevent any retaliatory crimes and a surveillance vehicle will be in the neighborhood for some time. The scene, at the Sierra Vista Homes, is just a few blocks from Van Buren Elementary School.

Investigators have not yet determined a motive for the shooting and did not have any suspect information to release.

If you have any information please contact the Stockton Police Department or Crime Stoppers.

A GoFundMe was created to help the family’s loved ones.