Damnnnnn

I dont know how or where to begin. This is a throwaway for obvious reasons.

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My wife and her brother has always been messing around, they were the type of siblings to take joking a bit too far (sexually). New people who meet with them have always said that they are the type of siblings who you would think are married if it wasnt for them being brother and sister.

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My brother in law lives very close to us. He is divorced and has 2 daughters who live with his ex-wife. My own wife very often takes over our son to his place, and also very often visits him herself. This is something I never ever had anything against, after all they are brother and sister. It wasnt until recently when my 4 year old son told me mommy and uncle tommy (lets call him that) had been kissing on the lips that I got suspicious. Apparently my wife had gotten angry at our son for no apparent reason for having seen this and she had told him grownups do this as a gesture of love.

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Now, i understand hugging or kissing a sibling on the cheek but in my 36 years on this earth I dont recall kissing my own sister mouth to mouth. That is just...disgusting to me. Tonight I did something which I never done or felt the need to do before, and I checked my wifes phone only to find a load ton of messages between her and her own brother. Most of it is just regular chat, nothing special. But after having scrolled through a ton of messages I find sections of intimate pictures between them, and even messages such as "horny", "want to come over for a quicky" and similar sentences. I am grossed out by the sheer imagination of my wife having had sex with her own brother, as this cause me to imagine ever having kissed any of my own sisters which is disturbing to say the least.

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Having sit here now thinking about what to do I cant do anything but to think my own son might not even be my own. So many times have I heard how "he looks like uncle tommy" and just looking at his face makes me believe this even more.

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I am really at a loss at this point, I have no doubts about what she has done, but I cant imagine also having lost the only thing that meant more to me than my own life, my own blood, my son.

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I feel like just jumping off a building or taking my own life if he ends up not being my child.

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I want to divorce her, but I dont know how to go on about finding out whether I am the father or not, I really dont know what to do if I found out my son wasnt mine.

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Edit: After reading several comments I decided it is best to not confront her now. My wife has been asking me multiple times what is wrong and I just told her I am not feeling well. I can barely look her in the eyes at this point. The only reason I am keeping it together is for my son. I wanted to go and sleep at a hotel but it would just raise too many questions on her part, so I will sit infront of the TV and sleep on the couch.

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Edit 2: Had no idea this post would spiral out and get this many responses, thanks i guess. I wont be reading more PM's, I have gotten way too many of them.

Currently staying with my sister, I decided it was not a good time to confront my wife yesterday, so I just told her I will be moving in to stay with my sister for a few days as she needed help with some stuff. My sister lives about 30 minutes away from us. I have told everything to my sister and she thought it was best to meet with a lawyer. We scheduled a meeting today, he will be helping me with the divorce and has also offered to help me get a paternity test (read some comment about a guy who did a paternity and got the wrong result) which is why I will get it via a court.

I will be getting a divorce for sure, this is not something I will ever accept or can forgive. It's beyond f***ed up. To the feminists out there who messaged me and told me to step up and forgive her, f*** you too.

I will confront her but I cant tell when, probably tomorrow. My sister wants to come with me, but I wont let her, I will head over there by myself and let her know what I found out, will see where it goes from there...

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