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How to Use Family Finder for Genealogy

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  • Guest's Avatar
    Guest replied
    Originally posted by RichardH View Post
    I have written an easy-to-understand web page describing the use of FTDNA's Family Finder in genealogy. This test is an example of a massive autosomal DNA test.

    Please take a look and then add any additional suggestions to this thread.

    Family Finder in Genealogy

    Regards,
    Richard
    I've traced paper trails to common ancestors for something like 15 people out of 59. I have my own ancestry worked out in full back through my great-great-grandparents, about 90% in the next generation, and then reasonably well past that back to around 1600 or so. That's a natural outgrowth of having early New England / New York ancestry from three grandparents and the same plus Pennsylvania English, Scots, Welsh, and German from the fourth. I've also been researching for over 20 years now, trying to find my immigrants to America.

    Anyway, my latest confirmed ancestral couple (you can't tell which person contributed the long DNA block) is from the 1690-1700 period birth-wise. The remaining matches have birthdates from about 1550 through 1650, either just before the migration to America or within a generation or two of it happening.

    The Great Migration ancestry links I have supposedly mean that I (along with many Americans) could be related to as many as 100,000,000 Americans within the last 400 years. So it's probably not against the odds that I have been able to turn up as many known relationships as this using DNA as the signal to check a pedigree.

    So while I understand that FTDNA is stating conservative probabilities as to what kinds of cousin relationships will be identified by the test, I suspect the test is actually pretty decent at ferreting out more distant relationships for people with extensive common ancestral pools. Interestingly enough, I'm getting matches of about the same strength with some Europeans without American ancestry. If you have a deep pedigree and find a Family Finder matching person with the same, you should look much farther back than FTDNA is suggesting, and you may well find one or more common ancestral couples. This is not the same as knowing that the DNA you share is guaranteed to be from one of that couple, but it may be indicative. I'm hoping that we have enough matches at some point to triangulate in on specific DNA segments as being inherited down specific lines.

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  • nolnacsj
    replied
    Originally posted by RichardH View Post
    I have written an easy-to-understand web page describing the use of FTDNA's Family Finder in genealogy. This test is an example of a massive autosomal DNA test.

    Please take a look and then add any additional suggestions to this thread.

    Family Finder in Genealogy

    Regards,
    Richard
    Richard, very good comparison!

    One thing, regarding Item # 4 "Supplemental Information" , you can now revise it to include FTDNA FF Population Finder which is now available with the FF test.

    Judy

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  • econnore
    replied
    Promethease

    I just downloaded Promethease and had it scan my Family Finder results. I got some interesting information about diseases I already have and diseases that close relatives have.

    Leave a comment:


  • barbara
    replied
    Thanks to all, I do lose track of relationship formula's

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  • gtc
    replied
    And here it is in table format:

    http://genealogy.about.com/library/n...nshipchart.htm

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  • mkdexter
    replied
    If you count the "G"s you get the cousin relationship.

    when two people have the same:
    (g)randparents = 1 g = they are 1st cousins
    (g)reat (g)randparents = 2 gs = they are 2nd cousins
    (g)reat (g)reat (g)randparents = 3 gs = they are 3rd cousins

    etc.

    of course this is assuming we are just talking cousinship, not siblingship or something else.. but I'm sure you know this is just a little mini-reference type of thing.
    Last edited by mkdexter; 26 July 2010, 11:27 AM.

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  • EdwardRHill
    replied
    Thank you that was clear and easy to understand.

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  • MMaddi
    replied
    Originally posted by EdwardRHill View Post
    You wright "Count out five generations to your great-great-great grandparents." If you count out five generation from yourself you will reach only your GG grandparents not your GGG Grandparents.
    You're trying to account for the make-up of your autosomal DNA when you test with Family Finder or a similar test. Don't include yourself in the count of generations, since your genome is the result of the previous generations' recombination of DNA.

    1 generation ago - parents
    2 generations ago - grandparents
    3 generations ago - great-grandparents
    4 generations ago - gg-grandparents
    5 generations ago - ggg-grandparents

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  • EdwardRHill
    replied
    I found a mistake

    You wright "Count out five generations to your great-great-great grandparents." If you count out five generation from yourself you will reach only your GG grandparents not your GGG Grandparents.

    Leave a comment:


  • Guest's Avatar
    Guest replied
    DNA and Genealogy

    I have tested at FTDNA for the Family Finder Test a where I have about 40 matches and at 23andme where I have 349. I am very happy with both companies. My proplem is that so many of my matches, including close matces of 3rd cousin won't respond to e-mails. Also, it is hard to know how you match others especially at 5th to distant cousin level especially if you are a females. I even have one match one my X chromosome which I can't find how I match with the person. It has been frustrating to me especially when my e-mails are ignored. I am trying to keep track of all my matching surnames to see if a pattern developes. Any other sugestions?
    SSowards

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  • gtc
    replied
    Originally posted by Beeswax View Post
    Actually I don't recall the name of the unzip program. It just came up when I downloaded my results from FTDNA, and I used it only that one time.
    WinZip will handle just about any compressed file format:

    http://www.winzip.com/downwz.htm

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  • Beeswax
    replied
    Unzip Program

    Originally posted by Darcy View Post
    What's the name of the free program?
    Actually I don't recall the name of the unzip program. It just came up when I downloaded my results from FTDNA, and I used it only that one time.

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  • Darcy
    replied
    Originally posted by Beeswax View Post
    Its my understanding FTDNA tried to avoid medical SNPs, but they missed some. Actually some of the ones I got were not serious medical conditions.
    For instance, light-skinned, blue-eyed Caucasian, and ability to taste bitterness.

    To use Promethease, you have to download your results using the link on your personal page. That comes out as a gzip file, then use the free program to unzip the data. That gives you a .csv format. Much larger than the gzip one. Then you download the Promethease program and run it against your csv file and that produces a detailed report. Mine came out with 1624 snps. Kinda complicated, but I'm not too smart and managed to get thru it.
    What's the name of the free program?

    Leave a comment:


  • Beeswax
    replied
    Medical SNPs

    Its my understanding FTDNA tried to avoid medical SNPs, but they missed some. Actually some of the ones I got were not serious medical conditions.
    For instance, light-skinned, blue-eyed Caucasian, and ability to taste bitterness.

    To use Promethease, you have to download your results using the link on your personal page. That comes out as a gzip file, then use the free program to unzip the data. That gives you a .csv format. Much larger than the gzip one. Then you download the Promethease program and run it against your csv file and that produces a detailed report. Mine came out with 1624 snps. Kinda complicated, but I'm not too smart and managed to get thru it.

    Leave a comment:


  • irshgypsy
    replied
    FF matches

    My problem:
    when I set my tree to show all ancestral related there are 10,624 people
    when set to Ancestors, with 5 generations of descendants, including spouses and parents, there are still 2838 people.

    That's a lot of picking and sorting for this "only child" to do!

    MJ

    Leave a comment:

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