Hi Julie,This may be to far of a reach but I haven't found alot on Pershalls.So it is worth a try.Mary Elizabeth does not sound familar.My Pershalls are as follows Henry Pershall m. Ruthie Horn.(possibly indian). Son William b. 1865 in Mo. Married Nancy Almeda Burns. They lived in AR. I don't know if William moved on his own to AR and married Wm and Nancy had several children.My g grandmother remembered living in Silom Springs, AR.I don't know of any other siblings of William's.Good luck in your search.