From: G6JPG@255soft.uk   
      
   On Sat, 14 Mar 2020 at 16:02:32, Percival P. Cassidy   
    wrote:   
   >On 3/14/20 2:46 PM, Jenny M Benson wrote:   
   >   
   >> Looking at my Ancestry DNA, I see quite a few people listed as having   
   >>a  Common Ancestor.  Several of these I know quite well and know   
   >>exactly  how they are related to me, but in several cases I have   
   >>looked at the  person has quite a small tree on Ancestry and not only   
   >>are none of the  people on my tree, but none of the surnames match either.   
      
   There seem to be two sorts of tree: a rudimentary one, often with about   
   ten people in it, that's shown on the DNA pages, and a "proper" tree, if   
   the person either has uploaded one or uses Ancestry to store their main   
   research.   
      
   I'm not sure where the rudimentary one comes from.   
      
   >>  I know Ancestry can compare my DNA with another's and say, with some   
   >>degree of accuracy, "You are 4th - 7th cousins" but how on earth can   
   >>it  say "you share ancestors Joe Bloggs and Jane Doe with A N Other"   
   >>when A  N Other doesn't have a tree including these people?   
      
   Ancestry's DNA matching does have - and use - access to "private trees".   
   You'd have to message the other member and ask for access to it.   
      
   >>  I have so far only contacted one of these people to ask if they know   
   >>of  the connection.   
   >   
   >Couldn't someone get the Ancestry DNA kit and have their DNA analyzed   
   >without having a tree on Ancestry.com? Someone could be have an   
   >Ancestry account for research purposes but only read information and   
   >never post any.   
      
   If they do that, Ancestry will tell them (and their matches) a match   
   level based purely on the DNA overlap; it's a fairly coarse estimate,   
   such as "fourth to seventh cousins" or (I think this is the bottom one)   
   "fifth to eighth cousins". It won't tell you "you share ancestor X with   
   this person", though, as it doesn't have that person's tree. (I _think_   
   it _might_ be able to do so if that person's DNA does very closely match   
   that of someone else who _has_ uploaded a tree, but I'm not sure.)   
   >   
   >Perce   
   >   
   John   
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