“Using Close Family Members
Ancestry Composition gets even more powerful if your parents or children are in the 23andMe database. You get higher-resolution results with either of these relatives added, and if you have a parent in the system you get an additional view into your results.
To enable this, you’ll need to be sharing with your parents and/or children. Learn more about sharing.
When you have a parent or child in the system, you’ll get a very high-quality phasing from Finch. That translates into better Ancestry Composition results, in the sense that you’ll tend to see more assignment to the finer-resolution populations: more “Scandinavian,” less “Northern European.”
Why is that? When you think back to our smoother example, we had two kinds of mistakes to correct. We had mistakes along the chromosome, and we had mistakes between the chromosomes. When you’re phased on the basis of a parent or child, it allows us to ignore mistakes between the chromosomes because they essentially do not occur, so we can be more confident in correcting the along-chromosome mistakes.
You get that boost in resolution with either a child or a parent in the system. It’s slightly better to use a parent than to use a child, and it’s slightly better to use two parents than one parent — however, you get the majority of the benefit with the first relative you add. The system will automatically use the best available configuration, and it will also automatically update your results if you share with a new relative. (As of this writing, it can take up to 48 hours for the results to update.)
If you have one or both parents in the system, you get an extra view. You’ll be able to see “Split View,” where we show the contribution of your mother to your ancestry on one side, and the contribution of your father to your ancestry on the other. We can’t provide this view if you don’t have a parent available, because a parent is necessary to orient the results.
Here’s an example of what you can do with this unprecedented view into your ancestry. Say that you find you have a small amount of Ashkenazi Jewish ancestry in your results. When you turn to split view, you’ll be able to see immediately which parent that came from.”
I have a task, one made difficult as happening in context of the decline of english-speaking world. My mother’s dna would be good to have ,perhaps something can be done to get my grandparent’s dna ? To test until I can find close relatives I need sponsorship. Now in Naples. Climate excellent .