Family Affair

This is a photo of Emmerson and Hortense Sapp. Emmerson is said to be the son of Mungeon Sapp, but I have yet to find any proof of that.  However, he was at the funeral service of my great-grandfather, Street Turner Sapp, along with his sister Jennie Sapp.  I am steadily searching the census records, but have yet to come up with anything.
I have been told that Emmerson donated his body to UCLA upon his death, so maybe I can find some information there.