My English Genealogy & DNA

My English Genealogy & DNA The personal research blog for the family history & DNA of genetic genealogist Mark Grace. Client services available. Family Historian & Genetic Genealogist

03/02/2026

Note to DNA testers - Time to think about logging back in to your various accounts as the post-Christmas kit results are starting to come in. After a quiet few weeks, there's defo an upsurge in matches now. February/March is usually the biggest months for matching. 🧬

Here’s a little question for those of you who use   and generally understand the range of shared DNA expected for any gi...
24/01/2026

Here’s a little question for those of you who use and generally understand the range of shared DNA expected for any given relationship. A section of the table is shown as the image.

Statistics indicate that the expected shared amount of cM between 2C1R (2nd cousins once removed) is between 14cM & 353cM with an average of 122cM. It can be a lot of very little. It is not zero. But can it be? Yes, it can.

I have an example that one of my 2nd cousins does not share any DNA with a mutual 2C1R. This is not reflected in the statistics even though I submitted this info to the table compiler. Many might consider this to be “impossible” and that something must be wrong. It is extremely rare, but it is possible if you think about it.

Here are two ways it might be, as the lower end limit for 2C1R matches is actually small at 14cM, so in theory you could find an example that exceeds this limit. Statistically small, but on the far end of probabilistic distribution that is not usually considered.

The match in question is on , a company that does not provide raw matches but results filtered through their algorithm. There is an earlier post on this blog which shows the results of my top 100 DNA matches where I have data both on Ancestry & for the same cut-off (assumed to be 6cM). Briefly, shared matches of 100cM or more are not affected by Timber, but as your matches get smaller between 50% and the entire match can be removed (i.e. Ancestry shows no match, whereas your own family DNA mapping study finds the match on ). This is the reason I do not like the way Ancestry presents its results in a “we know better about your family DNA than you” manner. This is the first possible explanation.

The other explanation is that it is possible to share the proportionate amount of DNA expected, but rather than being a single larger piece that can be detected and considered real by companies such as Ancestry, they are just off the minimum end. Currently, Ancestry shows matches shared as low as 6cM, which is well over the 50% probability of not being genuine ancestral matches at all. 15cM is consider the smallest segment size for shared ancestral DNA within a reasonable timeframe, with increasing chance of being false positives as the match gets smaller. What if my cousin and his 2C1R shared 15cM of DNA (above the minimum predicted for a match) but it is three segments of 5cM each? If all the data is on GEDmatch, you may find this an explanation. Ancestry would show no match.

Sometimes, it is worth stepping back an applying some critical thinking. There could be other reasons I have not considered, so I am happy to receive your thoughts.

My renewed interest in   came up with a new match to my sister's DNA. This HORNBUCKLE had a   mother who is in our famil...
22/01/2026

My renewed interest in came up with a new match to my sister's DNA. This HORNBUCKLE had a mother who is in our family tree. Turns out to be a potential confirmation of an additional branch from another son of Thomas (1815) through a new 6th cousin.

21/01/2026

Followers may now realise that if you have enough matches, even with small segments, you can go a long way to proving your lineages back to the C16th in some cases. This does require at least a few of these matches (7th plus cousins) to share their data with you on the professional matching database . You also need more than a little time on your hands to search matches and a modicum of patience. It is helpful if you have a less common name to find this matches on & .

I came across more than half-a-dozen new matches that have prompted me to reach out to see if we can get the party started on & in Nottinghamshire (the latter in the US being descendants of the VA settler in Stafford County), and from Derbyshire/Nottinghamshire.

I'll let you know if I make any progress.

Since my comprehensive investigations into the various DNA-matching lines for  , with the now ubiquitous chromosome 16 s...
18/01/2026

Since my comprehensive investigations into the various DNA-matching lines for , with the now ubiquitous chromosome 16 segment, it has been a while since I have found a new tie. Therefore, it is pleasing to find another 6th cousin downstream of my 5x GGF Anthony, via his grandson Joseph and his second wife Grace . We still have four other C16 HODDER lines not yet tied, which continues to suggest this surname marker comes from C17th or earlier. Word search HODDER for previous posts that discuss possible origins of the name and the DNA segment.

02/01/2026

A couple of additional discoveries following on from Ann being proven at 6xGGM. It turns out that her sister, Sarah HORN married a Jeremiah , who seems to be a 2nd cousin of Thomas (through Thomas & Susannah).

Having cousins extend their trees with the new BOWLES info has provide a tantalizing new connection (very small though) from cousin Sarah through Sarah & Ann HORN's brother William. I am waiting for the data to be shared which may prove this one way or another, i.e. push our DNA trail back another generation to 7x great William HORN & Mary LYON. That will be a result!

30/12/2025
Breakthrough on the   family of  , Kent,
30/12/2025

Breakthrough on the family of , Kent,

The BOWLES speculation has been running for 46 years, ever since I found out my 3xGGF Jeremiah married Mary Ann in 1836. We knew BOWLES was a common name so working out her ancestry was always going to be a problem. She was an only child and therefore any genetic expression inherited by GRACE descendants would be the only DNA on our side of the family tree available to match others.

Thanks to the collaborators in the family project who have DNA tested and shared their results, I have now successfully crossmatched 11 GRACE descendants with 10 BOWLES descendants in New Zealand. One segment on chromosome 5 seems to be a more common “family” marker and two others have been identified.

Thanks to the cousins giving me access to their match lists on , I was looking for clues way down in the low end of their lists. Any genetic connection was likely to be small. I was fortunate to notice a match with a distinctive pseudonym in several of the lists who had NZ BOWLES ancestry. Further investigation found a trail through other trees that lead back to in Kent, the same area our family came from. It was possible to use available records to connect both sides of the trees at a place commensurate with the degree of match, at my 6xGGPs; pushing back our BOWLES line by 3 generations. The genetically supported BOWLES family tree is shown in the image. It was John Jones BOWLES who settled in New Zealand. Matches in NZ are 5C2R, 6C1R & 7th cousins, depending on who matches whom.

I have several enquiries pending on Ancestry & which appear to be additional segments. I will post shortly the apparent paper trail back to Elizabethan times in St Margaret’s at Cliffe, near .

Happy New Year!

25/12/2025
12/12/2025

I recently ended my one month (now annual) sub to Pro Tools. I found that one month was more than enough and did not get much out of it, again. I did make a few unconnected rump trees of connected matches, but it was obvious the connection to me was not going to be found in near times. I am wondering if many who do not do research in a professional or serious amateur capacity get any more out of it, except minus €10 a month from their bank accounts? I can't image they make much money out of it except from those who forget to cancel their sub.

It'll be a year before I will sub again, or hope to see the chromosome browser we really need to make serious headway with the enormity of their database. It all remains locked up unless you can get a reply to messages and a willingness to GEDmatch. The free sharing to is, sadly, no longer available.

I did note today, an improvement in their match listing. I have always bemoaned the facts that the match listing was poor to non-existent below a certain level of shared cM, which missed known cousins. They are now showing shared matches into the single digits which will help find connections to those you have already connected. Baby steps towards being the complete package.

The latest update is completed (pp. 113). I shall be issuing it to participating DNA-matched cousins this week, based on...
03/12/2025

The latest update is completed (pp. 113). I shall be issuing it to participating DNA-matched cousins this week, based on email list. Remember, if you are entitled to a copy and don't get an email, please let me know.

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The Geneal Geologist

Just a personal blog about research into aspect of my English family history & DNA. I am an amateur genetic genealogist (known as "The Geneal Geologist" since 1979). Why that name? It is simply because family history rocks! I collaborate with those sharing the same ancestry and matching DNA.

This is not a business and no offer of research is implied. I hope your find posts here educational and relevant to your own research, which hopefully involves families we have in common.