Has anyone been able to find proof of a connection between Sarah Harrison and William Henry Harrison?

Question

I am a descendant of Isaac Corman. I have recently come into contact with a descendant of Billy Green. He is trying to establish if Isaac Corman was actually the 1st cousin of William Henry Harrison (later president) or if he lied about it in order to obtain the American password at the battle of Stoney Creek in 1813. It is commonly believed to be true in both families. He has written about it but requires definitive proof.

Answer 1

Would there not be a baptismal certificate for her, if it is true?  I am also a descendant of Isaac Corman and have never found any proof of this relationship.

Comments

This appears to be the marriage certificate."Maryland Marriages, 1666-1970," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:F4NX-NH7 : accessed 12 December 2015), Georg Kornman and Sarah Harrison, 25 Mar 1763; citing Frederick, Maryland, reference pg270; FHL microfilm 13,931.

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The marriage record is interesting.  It doesn't match with what I have  - June 21st, 1758.  

What would be really interesting is a baptismal certificate for Sarah Harrison.

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captain John Harrison of the revolution had a daughter Sarah Harrison but i believe she was born 1776

Answer 2

I believe it is a "story" as she is not mentioned in the account around the death of her father.   That occurred long before she married and all of the "story" about why she would have been left out of family history.  Also, there are many sources listed in the book, none of those include Sarah as a daughter.   Cowden, Gerald Steffens (July 1981). "Spared by Lightning: The Story of Lucy (Harrison) Randolph Necks". The Virginia Magazine of History and Biography (Richmond, Virginia: Virginia Historical Society) 89 (3): 294–307. JSTOR 4248494

Answer 3

Removed, duplicate of my finding from 2015