Joseph is there too, if he was born 1866. Two of the others died in Sonoma County. Given the rarity of the name, I suspect they are related.
Play around with it - put Tourady, Tourday and Tourdy in the surname, Father's surname and MMN, leaving all else blank. (Nine searches in all, not one.)
Google has 5 hits for Sonoma Tourady including one who loves horses and has a phone number. Try
His CDI says Joseph was b. California, but there are no people named Tourady or Tourday in the LDS 1880 at all, let alone California, so something is amiss. They may have been Touradyopolis or Touradyalski back then