Anyway, here's what I meant.
I followed your suggested route and found that the commonality wasn't in any direct line of ancestors. I also tried "Ancestors and children", found too many commonalities and wasn't able to figure out where the basic commonalities are. Since none of the Common Ancestors of father [in RED] showed up in the Mother's first Ancestor group, I'm pretty sure that the commonalities are within "cousin branches". It doesn't look like I can mark mother's group any more distinctly, given the options in the dialogue box.
It's been a while since I was able to work on this problem, due to health issues, and that may be a contributing factor here today. But I sure would appreciate some more suggestions! Maybe this line of thought would be contributory: Since I "unmarried" the parents in question, they shouldn't be linked by their own children. So...
Q: How can I calculate the total number of ancestors and cousins and all the otherwise unrelated spouses and kids, of either the Father or the Mother? If the total numbers are identical, that would indicate an early "crossover" still exists (maybe even more than one "crossover").
If the numbers are different, I could assume that the known crossovers might've been broken earlier and "disremembered" by myself. I could then create a new d/base of the separated family and examine that for commonalities.Thanks.