LegacyTree Genealogists Has a New Grandparent Mapping Tool

LegacyTree Genealogists is a genealogy research firm founded in 2004 and based in Salt Lake City but with professional researchers in many different places around the world. They do quite a bit of DNA work, which is how they got on my radar a few years ago.

Today, LegacyTree Genealogists released a new Inheritance Chart Tool for mapping a grandchild’s DNA to his or her four grandparents. The tool produces a chart showing exactly what segments of DNA came from which grandparent, along with a spreadsheet of those segments. There’s a blog post here: “Discover What You’re Made of with Grandparent Inheritance Charts.

One of the things I like best about this tool is the ease with which you can create a spreadsheet to upload and use the tool. At a minimum, you need three things:

  1. A tested grandchild;
  2. A tested paternal grandparent (either grandfather or grandmother); and
  3. A tested maternal grandparent (either grandfather or grandmother).

That’s right, you only need one grandparent on each side tested. This is because any DNA you didn’t get from a paternal grandfather must have come from a paternal grandmother, for example. You can, of course, use 2, 3, or 4 grandparents, depending on how many you’ve tested.

Here is a screenshot of the output of a grandchild’s DNA, using only only grandparent on each side:

On average, a grandchild receives about 25% of their DNA from each grandparent, but it can vary quite a bit. Here, you can see that on the maternal side, Luke inherited about 18% from his maternal grandfather, and a whopping 32% from this maternal grandmother. Instead of being 1/4 of a grandparent, he is 1/3rd!

I can’t really do this for myself, unfortunately, as I wasn’t able to test any of my grandparents. Although I’ve recreated almost 100% of my paternal grandmother’s genome, I don’t have a comparable amount on the maternal side. However, I did try it with just the paternal grandmother’s recreated genome, and it worked very well to assign my paternal DNA.

(NOTE: this is not a sponsored post, my blog doesn’t do any sponsored posts. I just like the ease of using this new tool).



8 Responses

  1. Christina Sabin 24 January 2017 / 11:53 am

    I plan to use this tool even though I have tested no parents, grandparents, children or grandchildren. By testing 2 siblings, a maternal half uncle and 2nd cousin and a paternal 2nd cousin I have been able to figure out most of my grandparents segments by using your visual phasing tool. I’m waiting for a paternal 1st cousin once removed’s results to hopefully fill in a few unknown segments.

  2. Blaine Bettinger 25 January 2017 / 9:35 am

    Douglas – there might be confusion of Lazarus and the LegacyTree tool. The LegacyTree tool doesn’t rebuild DNA, it uses existing kits to map DNA.

  3. KAM 25 January 2017 / 5:43 pm

    I ran this with my two children vs. a maternal GM and a paternal GM. Something seems odd. Although I know it possible, neither of the grandchildren reportedly inherited anything from the maternal GM. I tried the order of listing the maternal / paternal gp.. same thing?
    Any suggestions? KAM

  4. KAM 27 January 2017 / 11:16 am

    Amber at Legacy will update the instructions for FT-DNA. A slight nuance in how the names are entered (Initials/spaces) caused the issue. THANKS AMBER

  5. Velma Craven 31 January 2017 / 2:34 am

    Finding Daniel Robinson of north Carolina rand parents and his wife mollie

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