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Ed,

I think you may have misunderstood how Big Y works. Testing descendants is never recommended,?as you NEVER learn anything new from that. It won't confirm what you are hoping to achieve,?as it doesn't follow with the methodology you describe. If you have done BigY already then you will have a list of private variants. To know just how long ago you diverged from your designated haplogroup you multiply the number of variants by ~80 years (IF you have done BigY700, the current standard). Subtract that number from your birth year and you have an approximate?timeframe. IF this was a single SNP test you took at YSEQ, then it will be from a male much more distant from you, and no way would?it ever be a "terminal SNP".

Testing your son is simply going to create a massive branch for yourself and him which will obviously produce a new haplogroup designation. So if you have 10 variants?for example, you're now going to create a new branch that?has 10 SNPs in it with a new name such as FTA#####). That won't discover anything..it will just place the same already known variants on the tree from which you can ALREADY calculate?your divergence point.

A1133 won't be your "terminal?SNP" (which is mostly used improperly in this field to begin with). A1133 is the name of the haplogroup/branch/SNP that you share with your closest shared match. That's all. Terminal SNP is simply the last SNP mutation that occurred on your line, and requires testing of multiple men going back the last several generations to differentiate between them. If A1133 is from a male before surnames, you've had many new mutations since then. And at the end of the day, once you've had a BIgY match with the most distant known ancestor in common, finding your "terminal SNP" is academic/trivial at best. The point is to go backwards.

The ONLY way you can figure out about your haplogroup is testing cousins from older generations. Not by duplicating data.

Lucas McCaw