Share and share unlike

For the first couple of decades of our respective lives, Double Leo Sister and I were so unalike, and so seldom seen together, that many people mildly acquainted with us were unaware that we were related.  

This has changed steadily as we have aged and we're pretty similar now - at least in appearance and mannerisms, if nothing else.  

About five weeks ago, in the wake of our mother's death, I handed an Ancestry DNA kit to my sister.

Shortly afterwards, she managed to break her humerus and tear her rotator cuff. (This was just what happened, not cause-and-effect.) 

At any rate, I was pretty sure she had forgotten all about the test, and was preparing to remind her when she was down-Island, that if she really wasn't interested, she should give the kit back, because it's pretty damn expensive.

No, she said, she'd tested and furthermore, had heard back weeks ago.

No sign of her in my DNA matches, nor in those of my mother, whom I tested five years ago. 

You're thinking of all those stories, aren't you?  Those news items about people getting a DNA kit for Christmas and discovering, with a shock, that they're not related by blood to those they grew up with?

We should be so lucky. (I'm joking, but I think it crossed both our minds.)

Apparently, Ancestry now requires you to turn on match-sharing before it becomes visible to your matches, which, I guess, is a good idea, but it makes me wonder how many other matches I'm not seeing, because it's clear that most people take the tests to get the nebulous ethnicity matches, and don't bother with the matches at all.

Anyway, my brother-in-law, the Jolly Not-So-Green Giant, figured out what icon to switch, and there she was:  "Full Sister" - a slightly lower number on the centiMorgans she shares with Demeter, with nearly twice the segments that I have in the DNA match with Demeter.  Also, her ethnicity estimate is quite different than mine, which happens to be way more similar to my mother's - interesting, but in the long-run, not that significant.  Double Leo Sister has clearly inherited a different set of DNA from our shared ancestors; that's how DNA works -- it's more random that you might think.

Have I lost you yet?

I tried to talk about all this with my sister and brother-in-law, but like most people, they're really not into family history research, and they soon changed the subject. My sister is into Creative Anachronism and stained glass.  My brother-in-law is into computers and fantasy novels.  I'm not crazy about any of that.

I let them chat about these things with the Resident Fan Boy, while I started using my sister's shared matches to identify even more of our mother's and my shared matches.  

They went home early.