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[JSW]

A 8 cM segment match (un phased) has a 50% chance of being Identical by Chance IBC or in other words jus a random match
At 3 cM the odds are above 90% IBC.
Since you there are parent child pairs at gedmatch.com you can use the Tier 1 phasing tool to phase the child's data into the 2 halves....

[JSW]

Yes Doug your family example is closer to the statistics used of dating SNPs

RE some of the questions earlier
John, your brother has the same haplogroup designation as you, correct?
Yes FTDNA gives us the same terminal group. Thus the FTDNA software that does the matching...

[JSW]

Re "t sounds like a CA could be more recent but probably not more distant? " yes i agree at least somewhat.
To give you one example of how this would be With Big-Y 700 the number of SNPs that differ between me and my brother is ten(10).
So we are much closer than the calculation...

[JSW]

RE " I have different results from my father on three SNPs"
Hmmmm maybe that happens more than I thought On the Y-500 test I have a difference with my brother.
The difference is 3 novel SNPs and 2 Named SNPs both in of those two are in other groups eg SNPs normally in I when...

[JSW]

RE Would this tell me about when our common male ancestor was?
IMHO it will give you some strong clues to how far back the MRCA lived but it will not be definitive. Sort of + or - 100 to 150 years or so.

[JSW]

you must consider the quality of each mismatch on both sides
My brother and I have 2 named SNPs that do not match I think both are errors in scoring...

[JSW]

RE "that's pretty much a slam dunk, but I want some other opinions. "
Agreed!
Since you have you tested and (at least) one parent you should use the gedmatch phasing tool and phase your DNA
and see if that matches. there is over 99% chance it will
based on what...

[JSW]

Thinking more about one of my cases
Some of the people tested in this famil are actually
double cousins to someone one generation below the
top couple.
Will the tool be able to handle this case?

[JSW]

Interesting tool
I have two cases in my family I will be using this tool to
assist in my analysis
I will let you know how it goes.
Since I will be away from home until September it may be
a few weeks

[JSW]

Just FYI the longest segment I have found to
be unreliable was 14.7 cM
and at 7.8 cM about 50% of the so called matches are
just not real.

[JSW]

Yes that SNP is jut before the L159.2
See this page
https://www.familytreedna.com/groups...out/background

John

[JSW]

You are probably a member of the haplogroup L159.2
aka as 464xccgg
There are over 900 members of this group at FTDNA
and you can join it to see how you match up with the others

IMHO the group was founded by a man of some power about
the 1800 ybp in Ireland...

[JSW]

I have a family member 100% German as defined by
all 4 grandparents born in Germany (Central and Eastern)
Results are

European 99%
British Isles 75%
East Europe 24%

Thus using family finder to sort East vs West out is going
difficult...

[JSW]

RE "Any thoughts of how my late father's results appear on someone else's list "

I saw that happen to me earlier and then the match went away
I suspect that FTDNA still has 10% of the Big-Y Kits to do.
I am awaiting 2 from my groups.

[JSW]

In the Walden project we are still missing 2 reprocessed older Big-Y results. And one of them is mine.
Maybe by next year?