In an unrelated search I came across a reference in your records of an Edmund DeCew married to Leonora Moore (d/o of Martin Moore and Mary Lois MANN)
IF OF INTEREST TO YOU: The above noted Mary Lois Mann is the d/o Elijah Mann and Lois Graves - both born at Webster's Landing, Ononodaga, NY; which is now in downtown Syracuse, NY.
The family (Mann) along with several relatives moved to St. Thomas Ontario, Canada [which is in Elgin Cty near Aylmer]
Among the families, Elijah has a brother Jehiel Mann, his wife Hannah Decou/Decew, born abt 1806, d/o one Jacob Decou b:abt 1776; and his wife Catherine Buchner d/o Philip Buchner. **Jacob Decou is s/o Abraham DeCou, b:abt 1748 in NJ, USA, and his spouse spouse Mary Hibler b: abt 1792, presumably in the USA?**
Ergo, the Mary Lois Mann in your Tree is the same person as the Mary Lois Mann in my family; and a great grandaughter of Joseph Mann & Ama woodworth, the parents of Elijah and Jehiel. Both line married into the Decou family; and mine (as well as yours) would seem to both be descended through Jacob Decou.
I trust that this information will be of use to you. Regards Ronald Mann Edmonton, Canada firstname.lastname@example.org