I have been unable to find any census records for Charles Boydston or William McMahan in Osage County, Oklahoma in 1930 using the census search on Ancestry.com. I have tried many different . William married Laura a daughter of Charles and they may all be living in the same household. I found William's and his father's households in Fairfax Township in 1920. I only find his father's household in Big Hill Township in 1930. I also found Charles' household in Fairfax Township in 1920 so I believe William and Charles to be in the Big Hill Township in 1930. If anyone would please check another index or the census images for William McMahan and Charles Boydston(un), I would be very grateful.