While ThruLines® is only as accurate as the trees the information is derived from (sometimes questionable at best), thus far they've been fairly accurate for me. I'm only up to my 2nd great-grandparents on this project though. I suspect the farther back I go, the less reliable they'll become. But DNA doesn't lie. As long as we're above the 6cM threshold, where it becomes very important to watch out for false positives, we're likely related in one way or another (maybe even more than one!)
Below the 6cM threshold, matches may still be very distantly related (called identity by descent) or they may not be related at all (called related by state). Identity by state means while there is a match at a specific DNA location, it's simply chance. It can be hard to know the difference when the match is so small.
- 6cM-15cM generally share a common ancestor 5-8 generations back
- 4cM-6cM take time to look at shared matches if you're really trying to break down brick walls in this range. If you have some, you'll probably need to build out their trees to find the connection
- at 2cM-4cM there's a 67% chance you're not related
- below 2cM 70-99% will be unrelated
This week, I've linked 14 DNA matches to my tree! I know there are some researchers who can add 100 or more in a month. I'm not so quick and I'm happy at a much slower pace. I don't want to end up with a tree full of names and no records to back them up. I also want to balance my time so I continue to research those already in my tree.
Despite the age of technology we live in, some of the younger generations (those in their 20's or 30's) have a surprisingly small digital footprint when it comes to online records. Not only can it be hard to identify them specifically, it can be challenging to find the missing generations between them and my known ancestors to build the lines of descent. I do try to figure out connections on my own before reaching out. Public records and social media have provided some decent results, however, after several days of trying, I just wasn't finding a few of the connections I wanted to this week - so I reached out to four DNA matches (or those who manage their DNA) to see if they could help me fill in my blanks.
Messaging DNA matches is something I haven't done terribly often. This is probably because I see so many posts with frustrated users who reach out over and over and never get responses. I'm well aware people take DNA tests for various reasons, and they may or may not have an active interest in building a tree or connecting with relatives. Even those who do share an interest may be busy with life and simply don't log in often. It could simply be users are wary of chatting with someone they don't know.
I personally feel it's important to include enough information for the contact to discern the validity of the message and to verify I've identified actual people from their tree. In essence, I want to reassure them I'm genuinely researching and am asking for their help. I was careful to do the following in each message:
- introduce myself
- explain the common ancestors from whom we descend
- state the connections I have found
- indicate the missing generations I'm looking for
- politely ask if they'd be willing to share the names of those missing links with me if they're comfortable doing so
- include a polite closing or thank them for taking the time to read
I've been quite pleasantly surprised with the results this week! Two of the four people I reached out to have already responded, and have been willing to share with me. I feel it's important to:
- acknowledge and thank them for their response (regardless of whether they provided information or simply responded they have none to share)
- let them know I've added the match to my tree (if applicable)
- offer my assistance if they ever want to collaborate

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