Thank you again
Yes I have the 1880 census for Cynthia but Charles Frederick was born in 1881 (12 in 1894 +/-). In 1880 Cynthia was still living with her parents Ennis Slusser Thompson and Elmyra Thomspon. This family is very well dcoumented.
However, Charles Frederick's paternity is a mystery. Cynthia may not have married and I don't think she obtained a birth certificate.
I have been to VA archives and Library in Richmond and looked through every record I could find.
Thanks for your interest but I think this is a dead end.