(Willow, CA)  --  California Highway Patrol says a Beaverton man and his young son were killed Sunday night in a crash on Interstate 5.  Police say the chain-reaction crash involving four vehicles resulted in the deaths of Isidro Garcia and his two-year-old son, Fabian.  Authorities say alcohol was a factor in the wreck.  Garcia's family says he and his son were on their way back to Beaverton from Disneyland.