I just found out my son isn’t biologically mine. We are at a loss for words. Together 21 years, married 17. NSA.

So I finally got the DNA back today and recently posted about this before but thought id post again now that all results are back. So my wife and i have been together 22 years. I’m 42 and she is 45. She has a 19 year old daughter and a 16 year old son. Her eldest is not mine but is not my sons bio dad either and her middle child (my son) is not mine either. I knew this. My youngest though is 100% my child and is now just turning 9 years old. So we had always been consistent with our family and never kept any secrets. When our youngest turned 9 we felt it was time they knew about their family. So when our boy turned 9 my wife decided to sit them all down and tell them the truth. My son took it amazingly well. My eldest daughter was crushed. 2 years later (both kids know now) my daughter goes to a function for college (shes 21 now) She meets a young man at a frat party and they hook up. She ends up pregnant 8 weeks later. So we had a DNA test done immediately. I just got the results yesterday and im feeling awful. The guy she met at college? He is not the father. The father is my son (her brother). So today we sat all three kids down. My wife and i are at a loss for words. We told them the truth as to why all of a sudden my daughter was pregnant and why her and her brothers relationship changed. Now im not sure if this is normal or not but my daughter was actually ok with it. My son was ok with it. They were both like a “oh well. We had sex and now we have a kid together. Shit happens.” My wife and i were both at a loss for words. My wife cried and i just shook my head. Im not sure how to feel about all of this. My kids are ok with it though so they’re all good i guess.