Darley Tankey said her 28-year-old grandson, Fredrick Martin, was cleaning out the garage in the 3200 block of 109th Street when two men walked up and opened fire at about 7 p.m. Tuesday.
The victim's son and a friend were in the garage at the time.
"It's a family cleaning out a garage. Why? I don't understand. It's never happened right here before. Just confused, we're all confused about it," said Travis Toca, the victim's nephew.
The boy was grazed by a bullet but was not seriously injured.
Family members say Martin was a single parent who lived a clean life and did nothing to deserve being gunned down.
Detectives have not arrested any suspects and do not have a motive for the shooting. Family members called it senseless violence.
"He's not gang affiliated, never has been. He graduated from Texas Southern University," Tankey said.
Toca said Martin was "the sweetest man you'll ever find."
Police need the public's help finding the suspects responsible for the father's death. Anyone with information is urged to call the Inglewood Police Tip Line at (888) 41-CRIME.