There is an original copy at the Lehigh County Historical Society of an Orphan's Court document, dated 4 Sept. 1829 - "Petition of Henry Hisky, one of the sons in law of John Helfrich." This Petition refernces the property of John Helfrich, who died intestate on May 6, 1829 in South Whitehall, PA. Seven children are referenced as well as 7 grandchildren. Four of the seven children married Guth's!The children listed are...

George - Stated in the document as being his only son (He married Salome Guth)
Catharine - deceased - wife of Daniel Guth
Elizabeth - wife of John Guth
Eve - wife of Henry Hisky
Magdalena - wife of Jacob Guth
Regina (unmarried at the time the document was written)
Lydia - wife of Peter Roth

The grandchildren listed were children of John Helfrich's daughter Catharine and her husband Daniel Guth. They are as follows...

Michael
Anna
Elizabeth
Daniel
Magdalena
Lydia
Catharine

I do not have a copy of the entire document. It was quite large. But it references the division of property after John Helfrich's death.