According to “The Journal of John Fontaine: An Irish Huguenot Son in Spain and Virginia 1710 – 1719” edited, with an introduction by Edward Porter Alexander, Lucretia had three children and Elizabeth had six. This book states:
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James Fontaine did not leave County Cork with the rest of the family after the French privateers had destroyed the fortified home in 1708. He was a Justice of the Peace there in 1714. He married Lucretia Desjarrie in Cork.
When he came to Virginia he brought his wife, their oldest daughter Elizabeth, and his mother-in-law with him. By first wife he had three children. Around 1737, he married Elizabeth Harcum by whom he had six more children.
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My records have six children documented, three verified, as belonging to Lucretia Desjarrie, namely Elizabeth, James, and Ann. I have one daughter Asa in my records who is neither documented nor verified and who may be Ann under another name. She pops up in my research often and disappears just as quickly as she comes as being about Ann's age or slightly younger. For Elizabeth Harcum, I have only three children documented but not verified yet. All of James' children are accounted for in the book above by name except Asa, our mystery child.