Hello, I can't offer you any info on Petrus; however, I found out that my great grandmother was a Covington before she married John Groover. They were cousins so I believe the relations between Covington and Groover were close. How close? I don't know.
I did see some info on Petrus when I was searching for my latest attempt in finding out more about my relatives. If I find out anything else I'll let you know.