Yeah that sounds about right. I know that you're correct through William/Hannah.
I would have thought that you would have descended through William/Hannah's son James Schouten but you are claiming that your ancestor is Ephraim.This line sounds very familiar to me. I think you (or someone) sent it to me before.I know I've seen it.
Have you investigated Half Moon? and Smithville? I am unable to find the graves of William and Hannah and Maria Schouten. I know that they are buried in the Rosencrans lot now known as the Clifton Park Village Cemetery but I cannot find the stones. Our sometime Aunt Ruth Schouten Raymond and her husband are buried right at the entrance to the cemetery but no Wm and Hannah etc. Their burial in that cemetery is documented.
You can reply to me directly at BillCanfield@alum.suffolk.edu and we can exchange more info. Bill Canfield