This tool is designed to help you work out how one person, the "target", is related to a family group of people who have taken DNA tests. In particular, the tool is designed for when you have limited or no tree information about the target. The target may, for example, be an adoptee trying to work out how they fit into the family tree of a group of DNA matches. Or the target might be a new and unidentified DNA match who appears in your list.
To use the tool you will need to have the following on hand:
Consider an example scenario in which Peter is trying to work out how he is related to Lisa, Mary, and Nora.
With these pieces of information, Peter can use the tool to work out how he might be related to Lisa, Mary, and Nora (and, by extension, Alice and Richard). The steps are as follows.
You can also make notes and add them to this page, and can share a read-only version of your research.
After you place a DNA match into the tree, hover over their name and click on "Enter match cM". Enter how many centimorgans are shared by the target person and the match. That position in the tree will change colour and show the shared DNA amount.
Enter known matches into the tree and enter the cM amount that the subject shares with them
Create a hypothesis by adding a child where you think the target person could fit into the tree. Hover over that child and select "Use as hypothesis". That position in the tree will have a coloured badge added and will be assigned a hypothesis number.
You must have at least two hypotheses for the tool to work.
Each hypothesis will be automatically labeled as Most Likely, Possible, Unlikely, or Ruled Out.
After you have added at least one match and one hypothesis, a badge will be added to each hypothesis in the tree. The badge will contain a score that reflects the likelihood of this hypothesis compared to the others you've defined. If the hypothesis is statistically possible, the badge will be shaded in green; if not, it will be shaded red. Below the tree, you will see the hypotheses listed with the most likely first.
If one hypothesis is at least 20 times greater than the next, this indicates significant statistical support for this hypothesis
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This is an example tree. Create a new tree by clicking here
You are viewing this tree in read-only mode. If you would like to make edits, please click Save and make a copy in your DNA Painter account first.
Hover over a person for options. Scroll to the right to see children.
You are currently in read only mode. If you make edits to this tree, they will not be saved. If you'd like to save it to your DNA Painter account, please sign in or register (free). You'll then see the option to save a copy of this tree.
You can also download the data for this tree locally and load it back into the tool later (or send it to someone else so they can load it in).
To do this, click the button below.
After you've added matches and hypotheses to a tree, hypotheses will appear here.
This tool has been built to help solve DNA puzzles (including unknown parentage cases) by undertaking the calculations described by Leah Larkin in her series Science the heck out of your DNA...
© DNA Painter 2018
Due to the lack of statistical data available, this tool has limited applications to the following scenarios:
The underlying calculations that convert the compounded probabilities into the odds ratio used for the score were developed by Dr. Andrew Millard.
Valuable advice on the user interface and functionality was provided by Mike Mulligan. Many thanks also to the early beta testers from the GG&T group on Facebook.
The static tree layout is derived from an example by Peiwen Lu.