An article by Alva Noë and published in the NPR web site is a few years old but it contains some basic facts about genealogy-related information contained in everyone's DNA. If you haven't read the article already, you might want to do so now.

Here are some of the facts mentioned in the article:

You share no DNA with the vast majority of your ancestors.

You have more ancestors — hundreds a few generations back, thousands in just a millennium — than you have sections of DNA.

You have 64 great-great-great-great-grandparents — but if you are a man, you share your Y-chromosome with only one of them.

The amount of DNA you pass on to your descendants roughly halves with each generation. It is a matter of chance which of your descendants actually carry any of your DNA.

You can read DNA, Genealogy And The Search For Who We Are at https://www.npr.org/sections/13.7/2016/01/29/464805509/dna-genealogy-and-the-search-for-who-we-are