I know this isn't any help to your query, but my grandparents lived in Grayson for a time in the early 1920's. Their names were Philip and Elizabeth Harvey.
What interested me was the last name Ottenbreit in your query. By any chance do you have a Gerald Ottenbreit that was born around 1920ish that married Ida Chambers? Ida was my mom's sister.
Have you had any luck finding any kind of directories for Grayson during the 1920's?
Good luck in your search. Hope to hear from you if there is an Ottenbreit connection.......Shelley