This is a long shot but could someone look up to see if there was a divorce for a Harold Hart vs Alice (Blake) Hart in 1909 or 1910 in Nevada. I read that Mr. Hart went to Nevada at the time of his son's birth and then wasn't heard from again. Alice married Otto Kromann (my grandfather) in 1912 in Fresno CA. I don't know what happened to Mr. Hart so I am guessing that he divorced my grandmother when he went to Nevada. This is confusing to us as his first born son stated he saw Mr. Hart (his father) in Arkansas years later, so we presume he didn't die. My grandmother is listed in the 1910 Fresno, CA census as a widow living with her parents the Blakes and her 2 young sons.

Could you provide information that gives the first name of Mr Hart as Harold. I've seen it listed as Harry, Henry and George as well.
The 1910 Census would indicate the last name as Hart but it also states that Verling and Elmos father was born in Connecticut and mother in California. Have you found this Mr Hart in the 1900 census. it would be an important fact.