The crash happened in the area of 57th Avenue and Foothill Boulevard around 9:30 a.m.
The boy's uncle says he was inside the apartment building when the car came crashing in the side from a nearby car wash.
Family says debris fell on the boy - leaving him in critical condition.
A photo provided to ABC7 Eyewitness News shows the damage inside the home.
It's unclear what caused the crash.
This story is developing. Check back for updates.