A 17-month-old San Jose boy drowned in the family pool on Oxford Place on Thursday night, according to police.

The mother told police that she was tired and laid down to take a nap in the early evening. The woman asked her 17-year-old son to watch his brother, police said.

When she awoke at 8:20 p.m., the child was missing.

After a frantic search of the house, the 17-year-old found his little brother submerged in the pool and pulled him out, according to police.

But it was too late.

Emergency responders could not revive the child. He was pronounced dead at 8:50 p.m.

Contact Sean Webby at swebby@mercurynews.com or 408-920-5003.