DNA & Genealogy

Connecting people and families.

Genetic Genealogy

Genetic Genealogy uses DNA testing in combination with traditional genealogical research and historical records to infer relationships between individuals.

DNA testing has become an essential tool when researching a family’s history.

It is affordable and accurate, and the resulting DNA evidence can help solve family mysteries and dead-ends encountered in traditional genealogical research.

The Amazing Power of Your DNA

Genealogists worldwide are using DNA results to:

  • verify previous research
  • locate unknown origins of ancestors
  • confirm or disprove relationships
  • explore family legends and mysteries
  • determine surname relatedness
  • identify unknown ancestors (both recent and distant)
  • reveal biogeographical ancestry (admixture/ethnicity)
  • connect with cousins to share family information and photos
  • satisfy their curiosity and see what their DNA reveals


Learn more

Unknown or Misattributed Parentage

Every day, genetic genealogy is succesfully identifying biological families for people with unknown parentage – including adoptees, donor conceived individuals, foundlings (abandoned infants), child migrants, war babies, and amnesiacs.

Birth parents and gamete donors are DNA testing themselves in the hope of connecting with their offspring.

People with questions about their family structure or history are finally learning the truth through DNA testing.  And some people receive unexpected results after they do a DNA test for fun or family history.

Many never thought it possible, but answers can now be found from the privacy of your home, using a small sample of saliva or cheek cells.

To familiarise yourself with the most popular and effective test for identifying close relatives, read What is an AncestryDNA test?

Evolving Uses of DNA

Deceased Ancestors

Since genetic genealogy came about 21 years ago, direct-to-consumer DNA testing has focused on samples provided by living people.  Autosomal DNA is diluted by half with each new generation, so we’ve learnt that testing our oldest living generations produces the best DNA matches and helps identify family lines of our shared matches.

As genealogists wait patiently for closer DNA matches to help connect family lines, many wish they could have tested their deceased ancestors or relatives – such as parents, grandparents, great grandparents, great and great great aunts and uncles, etc – to reach a little further up their family trees or to solve specific research problems.

DNA services are emerging that attempt to extract DNA from items belonging to deceased relatives.  Saliva preserved on paper products and sealed in gum under envelope flaps and stamps can now be analysed to see if there is any useable DNA.  DNA extracted from hair and other items is also being trialled, as is using Whole Genome Sequencing (WGS) and obtaining different types of DNA.  If DNA can be extracted and successfully genotyped, the resulting DNA data files are compatible with existing genealogy DNA databases such as GEDmatch, so they can be compared with living people and other test samples for genealogical research.  Read more on DNA from deceased ancestors.

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Health Reports

Genealogy DNA tests were designed primarily for family history research purposes, so relying on the genealogy data for making health and medical decisions is not recommended.  Some companies have developed tests with a primary focus on health reports.  23andMe’s Health + Ancestry test is available to customers in the US, UK, Canada & Ireland, but not to customers outside those countries (Australians and New Zealanders do not receive any health reports with their DNA results from 23andMe).  MyHeritage launched their Health test and reports in May 2019.  It is now only available as an upgrade for customers who have purchased a MyHeritage DNA Ancestry kit.  Ancestry sold a Health test to customers in the US (except for NY, NJ, RI) for one year, but it was discontinued in January 2021.  Family Tree DNA has merged with myDNA, who sell medication, nutrition and wellness tests.  Living DNA also sells wellness tests.

Many genealogists do upload their autosomal raw DNA data files to third party sites for a nominal fee to receive reports based on health and medical research.  Any concerns should always be checked with a health professional and clinical genetic tests ordered if appropriate, and genetic counselling sought if needed.

Autosomal DNA testers can opt in at some genealogy testing companies to allow their de-identified data to be used for medical and pharmaceautical research.  Note that none of the companies sell your data as is sometimes sensationalised in the media… you must specifically opt-in to provide your consent to participate in research programs.

Medical research use of DNA is advancing at an amazing pace, including the growing use of Whole Genomic Sequencing to help diagnose previously undiagnosed conditions and to customise treatment for difficult cases.  Nebula Genomics sells Whole Genome Sequencing tests that examine all 6.4 billion markers in your genome (with 30x or 100x coverage), and Nebula states they are of the highest quality and can be used by physicians and genetic counsellors.

Forensics & Cold Cases

Investigative Genetic Genealogy – sometimes referred to as Forensic Genetic Genealogy – is being used or trialled by law enforcement agencies around the world to identify perpetrators of serious violent crimes such as rape and murder.

Some are cold cases that have remained unsolved for decades, and others are recent crimes where the aim is to apprehend the criminals quickly to prevent further offences.

Other agencies – not always law enforcement – are using genetic genealogy techniques to identify John & Jane Does (unidentified bodies) and unidentified human remains (UHR), providing much needed resolution for the families of those identified.

The terms of service of the biggest DNA testing companies (AncestryDNA, 23andMe & MyHeritage DNA) explicitly prohibit use of their databases by law enforcement.

  • Family Tree DNA allows limited use on a case-by-case basis with appropriate approvals.  Family Tree DNA testers can choose to opt-in or opt-out of visibility as a match to any law enforcement kits.
  • GEDmatch allows the upload of law enforcement kits to their database, via a separate law enforcement portal.  GEDmatch users can opt in or opt out of being visible to these kits, either at the time of uploading their DNA data, or at anytime afterwards from their kit profile management page.

For testers who opt-in, law enforcement or other relevant agencies do not see or have access to your DNA data, but if you are related to one of their uploaded samples, they may see you as a match and perform investigative genetic genealogy research techniques that could potentially point them to identifying a suspect or unidentified human remains.  Such identification would be used as a tip/lead only, requiring detailed investigation as per other evidence. 

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Louise Coakley

What is a Nebula Genomics DNA test?

Whole Genome Sequencing Nebula Genomics is a Whole Genome Sequencing (WGS) test.  Whole genome sequencing reads 6.4 billion locations in your genome, which is approximately

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Unknown Anzacs in family photo album

Unknown Anzacs in family photo album Below I have shared two photographs of unknown Anzac soldiers found in a family photo album that belonged to

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Do you recognise Pietro?

Do you recognise Pietro? Pietro never knew he had a daughter – named Franca.  Franca started looking for her father, or at least his identity,

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Kathleen, your aunt is looking for you!

After 41 years, Joan is still searching for her niece Joan Dunbar of Cairns in Far North Queensland, started searching for her niece, Kathleen, after

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What is an AncestryDNA test?

What is an AncestryDNA test? An AncestryDNA test is an easy-to-do-at-home DNA test that uses a small amount of your saliva to extract your DNA. 

Louise Coakley

Tips for Using GEDmatch

GEDmatch is a popular website used by genetic genealogists and family historians who are incorporating DNA evidence into their family history research.  Common questions asked

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What is a Family Finder test?

A Family Finder test is a very simple DNA test that anyone of any age or gender can do.  It is called ‘Family Finder’ because

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How to Establish a DNA Interest Group

Thousands of genealogists have tested their DNA for family history purposes, but from my experience it seems that many are not members of DNA Interest

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X-DNA’s helpful inheritance patterns

X-DNA’s helpful inheritance patterns When you test your autosomal DNA at any of the five genealogy DNA testing companies (ie. Ancestry, 23andMe, MyHeritage, Family Tree

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mtDNA: the Direct Maternal Line

Everyone inherits mitochondrial DNA (mtDNA) from their mother – through her mother, her mother, her mother, her mother, and so on – represented by the

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Y-DNA: the Direct Paternal Line

All males inherit Y-chromosomes from their father – through his father, his father, his father, etc – represented by the direct paternal line as per