I tried to e-mail you at firstname.lastname@example.org and that didn't work so I'll air my laundry here in public.
A long way back. Our last common ancestor was Janes Sr. and my line is off his other wife, Sophia Corbin.
I suggest you contact Phyllis Kirk (email@example.com) as her line also diverges at that point and she may have more information. Do you have access to the 3 volume bible of siasian research, "The Sias Family in America"? I can't check up in them now, as they are 8 time zones away from me, in Vermont. If you remind me around the middle of next July, I can do some looking up for you then.
If you'll write me with your correct e-mail address, I'll send you the information I haveabout James Sr., Charles, John Jr, and Jean Seyes, as a Word file. Much of it comes from the Sias books. The gravestones of Charles & Jane and of James Sr. are in the Newport Vt's East Main Street Cemetary and I have photos of those of Charles & Jane. If you're interested, I'll scan them and send them to you. Remind me in July and I'll photograph James' gravestone as well.