Dorastus has been found in San Antonio, Texas census and death record. He is listed by the name, Dan or Daniel, as you suggested. Let me know if I can give you more information? You may contact me at firstname.lastname@example.org
I'm looking for a death date for our Aunt Lib too. Do you know if she is buried in Lincoln, Nebraska? Would her obituary have been published in Uncle John's newspaper -- even though she passed away after he in 1910?