<human>: I'm shaking as I type this. I don't have anyone I can talk to and I'm really freaking out at the moment.

The rought backstory. I married my wife (44F) 11 years ago. She already had one kid from a previous relationship and now we have two more together. 

A few weeks ago my wife ordered a ancestry / genetic test through 23 and me. The results were funny so I decided to do one for myself and our kids.

In the ancestry section my wifes daughter had the exact same ancestral roots as our son, and our other shared daughter had no ancestral links to me.

I feel really confused and sick and I've searched online to see how accurate these tests are but I can't find anything and I don't know whether these ancestral genetic links are accurate or not. I really need help. Does anyone know what to do? Please?

Give me the gist of the text in a nutshell
<bot>: I did a 23 and me genetic test for me and my kids and my kids share no ancestral links to me and im freaking out that they're not mine.