DNA statistics- Paternal

DNA is not passed down exactly 50/50 from each grandparent pair. However, I still wanted to see just how much DNA I had identified using those parameters. I am not sure I got all the highest matches especially because I had to look at three different sites, but here goes my first try.

Note: I share 50 percent of my DNA with my parents and my daughter. On Gedmatch that number varies in cM from 3549 for Mom, 3552 for Dad and 3581 for my daughter using my 23andme test. Dad and mom are both on 23andme and my daughter is on Ancestry. For an average I am using 3560 cM as marker for 50%.  Differences are likely due to unreadable (no call) areas from the samples.

Based on the unrealistic 50 % DNA from each parent in each generation, this is what the contributed DNA “should” be for my parents, me and my daughter if every generation was inherited equally at 25 % for each grandparent’s DNA contribution.

Relationship to my Mom/Dad	Percentage	Dad/Mom’s estimated cM	My estimated cM	My daughters estimated cM
Grandparent	25 %	1780 cM	890 cM	445 cM
Great Grandparent	12.5%	890 cM	445 cM	222.5 cM
G.G. grandparent	6.25%	445 cM	222.5 cM	111.3 cM
G.G.G. grandparent	3.125%	222.5 cM	111.3 cM	55.6 cM
GGGG grandparent	1.563 %	111.3 cM	55.6 cM	27.81 cM
GGGGG grandparent	0.781 %	55.6 cM	27.81 cM	13.9 cM

My parents are only on 23andme and Gedmatch, where I am on Ancestry, 23andme and Gedmatch and my daughter is on Ancestry and Gedmatch only. (I am not using FTDNA or my heritage matches for this table.)  Since most “in common” identified matches will go back to a common ancestor pair (or double the DNA from the above table as “possible”) I wanted to look at the highest match to a known DNA pair for my parents, myself and my daughter. The results for my father’s side is below.

Surname of pair	Relationship to Dad	Dad cM estimated	Dad highest match	Me cM estimated	Me highest match	My daughter cM estimated	My daughter highest match
Barnes/Franklin	Grandparents	3560	370[i] 2C1R	1780	735 1C1R	890	486 1C2R
Hardy/Pyburn	Grandparents	3560	NA	1780	NA	890	NA
Barnes/Baker	G Grandparents	1780	266 2C	890	175 2c1R	445	109 3C1R
Franklin/Thomas	G grandparents	1780	69.5	890	173 2C1R	445	84.6
Hardy/Johnson	G grandparents	1780	146 2C1R	890	153 2C1R	445	NA
Pyburn/Mccurdy	G grandparents	1780	NA	890	NA	445	NA
Barnes/Owens	GG grandparents	890	34.6	445	69 4C	225.5	22.6
Franklin/Merrill	GG grandparents	890	NA	445	178[ii] 3C1R	225.5	NA
Baker/Vaughan	GG grandparents	890	NA	445	36 3c1r	225.5	NA
Thomas/ Brunson	GG grandparents	890	72.6	445	65 3C1R	225.5	20.9
Hardy/ Nelson	GG grandparents	890	106.8 2C1R	445	63.2 2C2R	225.5	55.5
Johnson/ Diamond?	GG Grandparents	890	NA	445	NA	225.5	NA
Pyburn/Chitty	GG Grandparent	890	64	445	55	225.5	22.3
McCurdy/Beck	GG grandparents	890	168.9[iii]	445	116	225.5	91.8
Barnes/Sanders	GGG grandparents	445	NA	225.5	66 3C1R	111.3	NA
Owens/Long	GGG grandparents	445	NA	225.5	NA	111.3	NA
Franklin/ Brunson	GGG grandparent	445	69	225.5	60.4	111.3	44
Brunson/Platt	GGG grandparents	445	80.5	225.5	64.8	111.3	44.5
Thomas/ unknown	GGG grandparents	445	NA	225.5	NA	111.3	NA
Merrill/Merrill	GGG grandparents	445	62	225.5	38	111.3	na
Baker/ Copeland	GGG grandparents	445	49.4	225.5	16	111.3	16
Vaughan/Jones	GGG grandparents	445	NA	225.5	NA	111.3	NA
Hardy/ King?	GGG grandparents	445	33.5	225.5	31 3C2R	111.3	NA
Nelson/Hudgens	GGG grandparents	445	NA	225.5	NA	111.3	NA
Johnson/ Parker	GGG grandparents	445	80.3	225.5	21	111.3	NA
Unknown	GGG grandparents	445	NA	225.5	NA	111.3	NA
Pyburn/ Stapleton	GGG grandparents	445	NA	225.5	NA	111.3	NA
Chitty/Brown?	GGG grandparents	445	45.8	225.5	39	111.3	31.6
McCurdy/ Sunday	GGG grandparents	445	33.9	225.5	27.2	111.3	26.2
Beck/ Woodcock?	GGG grandparent	445	81.9	225.5	11.4	111.3	NA

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[i] Double 2^nd cousin once removed. Dad’s first cousins aren’t on Gedmatch

[ii] He is related twice through Brunson/Platt and Merrill/Franklin (relationship closer)

[iii] Omitted the half cousins from William McCurdy and second wife in this line because they are double McCurdy’s it can alter percentages.