I do have some knowledge of a Frank Kestner in St. Louis, but he would have to be a son or nephew of your ggrandfather. The one i'm familiar with was evidently a brother to Sally, Dollie, Elizabeth, Mary, and Margaret. My mother who was Elizabeth's daughter always referred to him Uncle Frank. He was married to Aunt Katie and they lived on a real small farm in what is now Overland Mo. He was a motorcycle policeman in the city of St. Louis and had a heart attack either in the late twenties or thirties in front of the Sears store at Kingshighway and Easton in St. Louis and it was fatal. He was also a rather well known motorcycle racer way back then. I happened to have quite a few of his personal items including photos, uniform etc. If you think this might be the family line your interested in email me at firstname.lastname@example.org.