Sara: I show William and Harriet m. about 1820 with 8 kids including Margaret. I don't have further info on her and that file is not well sourced except that it's from Addison Foster's, PINEO Family History,(photographed 1968), Vol 16 page 155. I think I have a tiny bit of that Vol copied and I will look for it, but this isn't my family so probably I don't have it.If you go to Family Search and then search through the Library, it will tell you which Vol. have which parts of the family and you can go from there. If I find anything I'll e-mail you directly. Happy New Year.