Pernecia Fatima Frances House Family

I can not find my GG Grandmother anywhere!She was married to Samuel B. Norwood on 09 Oct 1835. I can trace the Norwoods all the way back to King Harold II.They are buried at Town Creek Cemetery in DeKalb County. All of my life I have heard the story of how they both died on the same day (of natural causes) 04 Sept 1896 and their son built a coffin large enough to bury both of them together. Does anyone know who her parents were? Thanks!