Is this normal behavior between adult male & female siblings
My wife and I have been arguing for some time over behavior she engaged in with her brother. I would like to hear the opinion of others as to whether this normal.
My wife and her youngest brother are only one year difference in age, have always been close, affectionate and at family gatherings have preferred to spend time together.
While dating, my wife made it clear that she was a modest person and at one time broke up with me because when asked I said I was dating other people. Though I wasn't she could only know what I told her.
Shortly after we were married her brother came to visit. Our apartment had 2 bedrooms that shared one bath in the hallway. After showering one evening my wife exited the bath wearing only a towel wrapped around her waist. She and her brother had a conversation of several minutes before she came into our bedroom where I was at the time. I was shocked at this behavior. An argument with me claiming this was inappropriate, immodest and different from what she had represented herself to be. She claimed I was over reacting, yet agreed not to do this again. About one year later we were visiting her family. Her brother's girl friend was scheduled for a lumpectomy soon and was anxious about the cosmetic effect of the surgery. My wife had had a lumpectomy and offered to show the girl her breast scar. She then went into a bedroom to show her breast to the girl. While doing so, her brother walked in. My wife did not ask him to leave and showed them both her breast and the scar. As this time, I was in the same house but only learned of the event months later. Another argument ensued. My wife again said I was over reacting.
Several years after this "scar" event, my wife’s sister told her that she and the brother in question had sex with each other when they were in their teens. I became even more upset at this point and worried that there may be a pattern of behavior in the family that at best was not normal.
My wife continues to tell me that I have over reacted, nothing abnormal has happened between her and her brother and that I have no basis for being angry and upset. Furthermore, that my reaction is damaging our relationship. My feeling is that even if this is behavior she finds acceptable, I do not. Assuming my facts are generally correct, have I over reacted? Is this normal behavior between adult siblings aged 30- 35?