Because of the pattern of inheritance, such that her grandsons apparently inherited many parcels of land from the Demont family, it is tempting to suppose that Jeanne was herself a Demont, perhaps a sister of the notary Rodolphe Demont. Also, Demont recorded a great number of documents concerning the family. However, no more substantial evidence of a relationship has yet emerged.
Joyce or possibly Rejoice has been taken as the daughter of William Plasse by
his first wife. While this is possible, no evidence has yet surfaced that he
had such a daughter. The basis for this claim is presumably that Richard
Waters declares himself the "son-in-law" of Plasse. But 17th Century usage
would give him that relationship through his mother's marriage to William
Plasse, even if Joyce is not the daughter of Plasse. See "One Waters Family",
1980, Jeanne Waters Strong.