Antti,
I don't think they are related but there is this. Tolbert F. Stovall (one of the founders of Jaggars Chiles Stovall) had a son named Robert L. Stovall.
Amongst other things (including being elected President of Jaggars Chiles Stovall in 1960), Robert was a co-owner of a company called Grinnan Development Co. The other owner was Lewis P. Grinnan Jr. who was the brother of Joseph Grinnan.
James
1. They were not related.
2. Regarding Grinnan Development Co. and Robert Stovall being a co-owner, were are you coming up with this information?
-Mike