The DNA tests associated with the family genealogy are as follows.
Michael Jefferies; Tests with Ancestry and My Heritage. Result connected to the Wansbury Family Tree on Ancestry. Y-DNA test on FamilyTreeDNA at Y700 and Big Y levels plus mtDNA. The single tests and the combined tests are on GEDmatch as MX941038C1
Louise Simon; test on Ancestry; result connected to the Mead/Gough Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies’ account.
Nicholas Galton Jefferies; test on Ancestry; result connected to the Mead/Gough Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies’ account.
Melissa Clark; test on Ancestry; result not connected to a Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies’ account.
Elinor Nash; test on Ancestry; result not connected to a Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies’ account.
My main tool for DNA comparisons is DNA Painter, in my opinion this has allowed links between matches to be explored most effectively. Much more work is being done to paint individual maps for each of the 5 tested family members and this takes time. The analyses done so far have shown some groups with, currently, no documented links to ourselves as well as confirming known family groups with common ancestors. The results are accessible to anyone as a read-only link for each person in the links below, which will open in a new tab.
Michael Jefferies; DNApainter LINK
Louise Jefferies (Simon); DNApainter LINK
Nicolas Jefferies; DNApainter LINK
Melissa Jefferies (Clarke); DNApainter LINK
Elinor Jefferies (Nash); DNApainter LINK
The resource numbers on GEDmatch are mainly for Michael Jefferies. The resource that combines to analysis of both tests (Ancestry & My Heritage) is MX941038C1. The resource number for Nicholas Jefferies’ test is RT6486642. These resources are free to use for anyone with a GEDmatch account and a fee subscription is available.
I have tests on myself, my two children and my two nieces, my brother's children. I have also been given access to other tests as an observer or contributor, for particular branches of the family. Some of the differences between those tested are as follows.
Michael Jefferies; Tests on Ancestry, My Heritage. Result connected to the Wansbury Family Tree on Ancestry. Y-DNA test on FTDNA at Y700 level. Currently there are 21,000 matches on Ancestry & 10,150 on My Heritage. Currently there are 384 matches to 4th cousin or closer. In practical effect this is pointing to ancestors at my g-g-grandfather level who will be in the ancestry of those matches.
Louise Simon; test on Ancestry; result connected to the Mead/Gough Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies' account. Currently there are 17,550 matches on Ancestry & 14,410 on My Heritage
Nicholas Galton Jefferies; test on Ancestry; result connected to the Mead/Gough Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies' account. Currently there are 19,000 matches on Ancestry & 12,5050 on My Heritage
Melissa Clark; test on Ancestry; result not connected to a Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies' account. Currently there are 20,200 matches on Ancestry & 11,500 on My Heritage
Elinor Nash; test on Ancestry; result not connected to a Family tree on Ancestry. DNA also uploaded to My Heritage on Michael Jefferies' account. Currently there are 17,650 matches on Ancestry & 14,510 on My Heritage.
Both MyHeritage and GEDmatch show actual chromosome matches. This feature is very helpful when plotting DNA segments but Ancestry tests do not, but the raw data from the Ancestry test can be uploaded to GEDmatch.
A further enhancement is the addition on Ancestry of 'Pro tools' which are particularly useful in providing such techniques as sorting the matches in groups of relatedness, origins, using clustering to further understand family groups, as well as a tree error checking tool. Remember that this is a work in progress as more data is added and the way the data is handled may change over time as specific matches are labelled more accurately or reassigned to other lines.
Matches that involve shared segments below 10cM are known to be problematic. While we have some persons with known paper links found by matches of less than 10cM this can be misleading; the Blog 'The Genetic Genealogist' by Blaine Bettinger, has articles around this issue if you are interested. A summary of this article is:- "Many to most small segments (at least 7 cM and smaller) are FALSE, meaning they are NOT actually shared by the two matches, and therefore do NOT indicate shared ancestry; This is supported by a 2014 paper by 23andMe scientists showing that at least 33% of 5 cM phased DNA segments are false-positive (and it’s much worse for unphased segments or segments smaller than 5 cM); This is further supported by evidence that anywhere from 20-35% of distant matches at a testing company are not shared with either tested parent; This is further supported by evidence that phasing your DNA with two tested parents significantly reduces the number of matches below 10 cM (with proportionally more matches reduced as the segment size gets smaller); There is currently no evidence that triangulating segments or finding a paper trail provides a mechanism for distinguishing between false segments and valid segments; Since we can’t tell the difference between false small segments and valid small segments, we must avoid these small segments to avoid poisoning our genealogical conclusions with false data; and beware any conclusion that uses these small segments without specifically addressing the issues that are known – based on all the scientific research and evidence gathered to date – to surround small segments."
I am reaching out to persons who are identified by these processes and welcome any such requests. I have some very helpful replies in some cases and none, so far, in others.
Revised July 2026