Brothers Giovani and Cristian Cereijo knew something was wrong with their 73-year-old grandfather when they saw him passed out on his home floor.
Giovani, 9, and Cristian, 11, both of Burbank, didn't overreact or panic, officials said. Instead, they immediately called 911 and got help from a neighbor.
"I was nervous and strong, but I was also feeling brave because me and my brother were saving my grandpa," said Cristian, who was on the phone with an emergency operator during the incident on Saturday.
Officials agreed that the boys' actions helped save their grandfather, who may have suffered from a seizure.
"This is my second chance for life," said the grandfather, Reynaldo Martinez.
The boys were visiting their grandfather Saturday while their mother and grandmother were running errands.
And like every visit, the boys played in the yard while their grandfather was inside making Christmas cards.
Reynaldo's memories of the events leading up to the seizure were a bit fuzzy, but he reportedly got up from his chair when he heard the mail carrier drop off some letters.