I wrote the biog of Daniel Jenkins' composer son Edmund T Jenkins (1894-1926) who studied here in England 1914-1921 at the Royal Academy of Music, London. The book (Greenwood Press, 1982) can be found on Abebooks etc. I found no pic of Lena J (ETJ's mother).
I have attended 3 of the Charleston Jazz Initiative's meetings and am interested to know what you have found and published.
The Jenkins band picture in Ball's book is one I gave to the Center for Black Music in Chicago.