I just saw your post about the Artman family. I have all of the same people in my family tree. I think your Benjamin is my Abraham who is my 3rd great grandfather. The other siblings you listed match the siblings in my tree.
The parents are Andreas Erdman and Anna Dorothea Siegfried who was the mother of Catherine and then he married Anna Frederick. She had the rest of the children. They were Johann Andrew, Anna Margaretha, Elizabeth, John, Abraham (Benjamin) Jacob and Sybilla.
My information says that Abraham (Benjamin) and Sybilla are buried in the Arman family cemetery on the old Artman farm in Allegheny Twp, Westmoreland Co.
I have approximate birth and death years and spouses if you are interested. None of my information is sourced. It all came from a cousin of mine who has since died.

Virginia