1) If Peter & Katharina were brother and sister, this would make their kids double first cousins, because Peter married Susanna, and Katharina married Jakob, Susanna's brother.
2) This also makes Peter & Katharina's grandchildren double second cousins:
As double second cousins, we would expect them to share about 425 cM of DNA. So far, I've tested three possible double second cousins: my grandmother (circle pictured above), her first cousin (not pictured) and the man represented by the square above.
Grandma's first cousin and the man represented by the square share 490cM of DNA. That's great. That's about 65cM more than we would expect. However... they share X DNA. Because they're both males, we know this DNA could only have come from their mothers. Grandma's first cousin's mother doesn't factor into the KLASSEN puzzle to my knowledge but the mother of the man represented by the square was actually a KLASSEN. *alarm bells* The fact that they do share X DNA does indicate some sort of relationship between Anna (pictured above) and the mother of Grandma's first cousin (not pictured). It could be another KLASSEN connection, or it could be completely inconsequential to what we're working on with our KLASSEN line. Right now there's no way to know for sure, but it is enough that it could account for the extra 65cM of DNA they share.
Grandma and the man represented by the square share about 319cM of DNA. That's a little less than I had hoped for, but not enough less that it's a problem for them being double second cousins.
Between the three relatives, they share a total of about 809cM, of which only 69cM overlaps. We know now that it's likely those 69cM came from some combination of David Falk & Maria Schpansky, and the unknown Klassen parents, but we need to get more data in order to figure out which of the pairs each piece came from, and from there, which person in each pair it came from.
So, now we wait for that KROEKER/KLASSEN test. That relative is a half-uncle of my grandmother and her first cousin, so they should each share 850 cM of DNA with him. He's also a first cousin, once removed to the man represented by the square above, so they should share 425cM of DNA, some of which will be shared with my grandmother, some of which will be shared with my grandmother's first cousin, some of which all four of them will share, and some of which will only be shared between the first cousins, once removed. Based on the known relationships, the 425cM of DNA that the KROEKER relative and the man represented by the square share should have all come from David Falk & Maria Schpansky, since the KROEKER relative has no known connection to the KLASSEN line. Getting those segments figured out will help a bunch.
I *know* that was confusing, so if you have any questions, please leave me a comment and ask! :)
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