Ancestry/Genealogy

DNA results have no clue what branch of your tree they are from. They can be compared to other individuals, and their tree and yours can be compared to see how you are related, if both trees go back far enough to contain common ancestors. But there is no way to say that a particular stretch of DNA is from your mother's father's line.

The only thing that can be done is to determine that these two people are likely related, and then it's digging through their trees to find the common ancestors. My results show me thousands of people who I am related to, but since they have no tree linked to their results, I'll likely never know HOW I am related to them.

Being able to show how two people are related already exists in many family tree programs, but you have to pick the two people.