I have a John Van Seyoc, whom I'm trying to tie to the NY/NJ Cornelius Aertsen Van Schaick line.My John was born 21 Sep 1755 and died 12 Feb 1838 in PA.He married to a Martha and had the following children: Jane, b. 1780; Margaret, b. 1781 m. John KELLEY (this is my husband's line); Sarah, b. 1784, m. John MUMPER; Benjamin, b. 1786; Achsah, Abel, b. 1791.John Van Seyoc was in Toboyne Twp., Perry Co., PA in 1820 as John Seyhock.Anything sound familiar to your line?