The children of Sythia 'Seth' Summers and Sythia 'Seth' Summers appear to be intermingled and mixed up, most probably because of there being two different John Summers. The merge revisions are inconsistent enough that it doesn't provide much help in teasing them apart.
I suspect it'll take some working upward from the children or even grandchildren to tease apart these conflicts -- based on records as much as possible!