Actually happened in my family. My daughter looked so much like me but with her mother's skin tone. She even had my sense of humor. While I went to trade school my wife babysat for another family. The husband and wife were both blonde and blue eyed as were their four children. Weirdly My wife would stay at their house even though the husband got home two hours early and she'd wait until the man's wife got home but I guess she was waiting for a ride home from the wife since I had our truck at trade school in another city. Then suddenly she refused to babysit or even pick up her pay until I just drove her over and refused to leave until she collected her pay. She was so nervous she was visibly shaking and refused to tell me what happened. My theory to this day was that she got caught fucking the husband. We had been using condoms since my daughter was born but about a month later my wife suddenly didn't want to use a condom. A week later she announces she is pregnant. When the child was born, guess what? Blue eyes and blonde hair. Looks nothing like me. The tension over this child drove us further apart even though at the time I believed he was mine and ignored any suggestion to the contrary by well meaning strangers who would ask if he was adopted. I chalked it up to genetic diversity. One thing I noticed at the time was her antagonistic attitude to our daughter while doting on the boy much overt affection. My attitude toward the boy was awkward. I just wasn't feeling parental. He felt alien to me and the favoritism by my wife was distressing. She wouldn't help the toddler get dressed or even comb her hair. I'd come back from work at the factory and find the child dirty, disheveled hair and still in her jammies. I'd feed her, bathe her, get her dressed and hair combed. Trying to get the wife to treat our daughter with a bit more care just led to more arguing. After our separation and divorce the cycle would continue but now she would beat her or let her mother beat her. Police did nothing even though my daughter herself complained an brought the horse whip she had been beaten with. One confrontation during the divorce really stuck in my mind. I had been laying awake at night pondering events and suddenly had this puzzle fall into place and realized how deliberately blind I'd been over the years I'd been married. This bitch had been cheating on me throughout our marriage. Next day I told her to her face the boy was not mine and I knew who the father was. She refused to look me in the face, looked shocked and hung her head while quietly denying my allegation with, "oh, he's yours" and then drove off. Her denial sounded weak at best considering the seriousness of the topic.