Please read my last message again. Cornelius Van Siclen married as his second wife Catherine Johnson. He had children by both wives. Among his children was Cornelius. (I had said Cornelius, Jr., if you like.) You seem to keep missing this. There were two Corneliuses; one married Catherine Johnson, the next married Hannah Lawson and removed to Canada.
Thus, there is no conflict on dates between Doug and I. As already noted by his will, dated and proved 1805/6. Fanny & Ferd & Violetta mixed up these two Corneliuses, father and son, just as you are doing.
And yes, the Cornelius Van Siclen who married first Femmetie Vanderveer (her mother was a Van Sicklen, by the way), then Catherine Johnson (she also appears to have had Van Sicklen ancestry), is the brother of my ancestor Johannes Van Siclen of New Lots, Brooklyn.Cornelius was the youngest son of Ferdinandus(3) Reinierse Van Sicklen and Maria Lanen.
Regarding whether Violetta was accepted into the National DAR, I may have misunderstood what was said about this among the volumiosous emails passing between you and Doug over all this time. In any event, I have seen no indication that the Cornelius Van Siclen who married Catherine Johnson was a Revolutionary War Vet. If you have that documentation--other than Violetta and the clan's memory on what "Mom told them," please present it.
By the way, I am using the Van Siclen spelling here, but at various times the name was spelled several ways-just as it is today. Harping on this spelling business does not signify and is simply not a viable argument. This is nothing new to anyone who spends time among the actual records. What you insist upon is simply not true, not even within the very items you continually quote.