Month: May 2019

Throwback Thursdays #tbt – Christian Fredson and family

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Christian Alfred Fredson (aka Chris) was one of my relatives on my Danish side, related to me through my maternal grandmother’s father.  In fact, my great-grandpa Charlie Holst was a first cousin of Chris.

In this photo, on the front porch of their home in Geyserville, Sonoma County, California — I do not know if the house is still standing — Chris is the young man on the left.  He was born in 1891, a few years after my great-grandfather, and is probably in his late 20’s in this photo.

His mother, Sophie (Thomsen) Fredson is to Chris’ left.  Sophie was my great-grandfather Charlie’s maternal aunt, a younger sister of Caroline (Thomsen) Holst.  Sophie was born in 1860 in the Danish duchy of Slesvig, just a few years before Bismarck invaded, and that land became part of what is now Germany.  (Sophie died in 1924; therefore this photo was taken no later than that year.)

Fredson2400dpi

Seated on the steps is Chris’ wife Geneva (Eagle)Fredson (1891-1973).  Next to Geneva is their first-born son, Leonard, who was born in 1914, and looks to be about 2 years old (so the photo was likely taken around 1916.)

Behind Geneva and Leonard are 3 older adults.  I am presuming that the man with white whiskers and the woman are Geneva’s parents, but cannot confirm that.  The man wearing suspenders and seated in what might be a rocking chair is Israel Fredson.  He was Chris’s dad, born in Sweden (somewhere!) in 1850.

Chris Fredson had an older sister, Hilda, who never married, and an older brother Charles, who had one daughter.  Chris and Geneva had 3 children: the aforementioned Leonard, a daughter Anna (1918-1925), and a son Donald (1919-2007).

Triangulation vs. “In Common With”

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This question came up in one of the posts in Blaine Bettinger’s Facebook Group Genetic Genealogy Tips & Techniques, so I thought I’d give a quick example here that I refer to myself when I get confused.

A man with 3 children, who have all tested, has a match to a 2nd cousin (documented through now through both DNA and traditional genealogy).  He and the 2nd cousin share 11 segments of DNA.

It so happens that all 11 of those segments have passed down to those 3 children, which you can see in the illustration below.  Of those 11 segments shared by their father and his 2nd cousin, Child 1 inherited 4 segments.  Child 2 also inherited 4 segments — but an entirely different four segments than Child 1.  Child 3 inherited 7 of the 11 segments.

The inheritance and sharing is illustrated below, in data pulled from GedMatch.

Inheritance

For purposes of illustration, we’re setting aside the fact that generally, when triangulating to find a common ancestor, we don’t use two full-blooded siblings as 2 of the triangle legs; they are too closely related, and will triangulate on many segments.

That said, Child 1, Child 2 and their 2nd cousin once removed (2C1R) have DNA in common with each other, but no triangulated segments with their 2C1R.  This is because Child 1 shares DNA with 2C1R on chr 6, on chr 12 and 2 segments on chr 15, while Child 2 shares DNA with 2C1R

Child 1, Child 3 and their 2C1R have 3 triangulated segments: on chr 6, on chr 12, and 1 segment of chr 15.

Child 2, Child 3 and their 2C1R also have 3 triangulated segments: on chr 4, on chr 8, and on chr 18.

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And that is a quick overview of triangulation vs. in common with.