Hi, I looked for Arthur White but didn't find any information.
It's possible that William's parents were listed in his obituary. However, finding an obituary in Orange Co. is difficult. There are many towns and newspapers and there isn't one place to go to for all obituaries.
The largest newspaper in the County was the Orange County Register which was also most expensive and a lot of folks didn't publish their obituary in that newspaper. The on-line records for the Orange County Register only go back to 1987.
You can pursue his obituary by contacting the Orange County California Genealogical Society, occgs.com . If they can't find it you might have to order a copy of William's death cert to find out exactly where he died.
Do you know when and where William was married? His parents names and where they were living at that time might be listed on his marriage certificate. Successful Searching!