Sunset at Gowanus Bay

Sunset at Gowanus Bay
Sunset at Gowanus Bay, Henry Gritten, 1851

Monday, April 10, 2017

New Haplogroup Sub-branches for the Adam Brouwer Branch of YFull's YTree

The YFull online YTree has now been updated. The current version is v5.03. The new version splits our known descendants of Adam Brouwer into two sub-branches with their terminal SNPs (haplogroups) identified as E-Y19643 and E-BY6245.

The new revised branch appears as follows:


  • E-Y19643 Y19645  Y19643  A9487+15 SNPs formed 4000 ybp, TMRCA 425 ybp
    • E-Y19643*
      • id:YF08704
      • id:YF04988DEU [DE-NW]
      • id:YF03732DEU [DE-NW]
    • E-BY6245BY6245 formed 425 ybp, TMRCA 375 ybp
      • id:YF08703
      • id:YF05152DEU [DE-NW]

The earliest known ancestor (EKA) for each of the id numbers in the above are:

id: YF08704 = Benjamin Brewer (1755-1834) m. Catherine Mellinger and lived in Fayette County, Pennsylvania and later Washington County, Indiana.

id: YF04988 = John G. Brewer (1795-1886) m. Sarah Miller, and is believed to have been born at Trenton, New Jersey, and lived his life at Miami, Greene County, Ohio.

id: YF03732 = Adam Brouwer of Gowanus, L. I. through his son Abraham Brouwer who m. Cornelia Caljer and lived at Gowanus.

id: YF08703 and id: YF05152 = Peter Brewer (b. 1750-1760, d. 1840/41) m. Margaret Hobach and lived in Westmoreland County, Pennsylvania and later Hardin County, Kentucky. The two descendants tested are first cousins.

Although only one of the above members can demonstrate an ancestry back to Adam Brouwer by way of traditional genealogical research, we do know that all must be descendants of Adam Brouwer by virtue of the fact that the results of their Y-DNA tests closely match both in earlier STR testing and the more recent and more advanced SNP testing. Please see the Adam Brouwer Sub-group Y-DNA Analysis page at the Brouwer Genealogy Database website for STR results and lineage charts of participating descendants.

Testing is done through the Brewer DNA Project affiliated with FamilyTreeDNA (FTDNA) using their Big-Y Test. FamilyTreeDNA presently assigns all five participants to the haplogoup E-BY6201. YFull's analysis, which utilizes more data from FTDNA's Big-Y test than FTDNA itself uses, gives us the two different haplogroups seen above. YFull's haplogroup assignment is considered superior to FTDNA's assignment.

The Adam Brouwer Sub-group of the Brewer DNA Project very much needs additional members to take the Big-Y test and have the results analyzed by YFull. The Project would especially like to see descendants who can confidently trace their lineage back to Adam Brouwer through his sons Pieter, Jacob and Nicholas, take the test. Existing members can immediately order the Big-Y test, while any new members would first have to take one of FTDNA's standard Y-DNA (STR marker) tests. Please contact the administrators of the Brewer DNA Project through the e-mail links available on the Project's webpage for more info.

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