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The Dursleys had everything they wanted, but they also had a secret, and their greatest fear was that somebody would discover it. They didn't think they could bear it if anyone found out about the Potters. Mrs Potter was Mrs Dursley's sister, but they hadn't met for several years. In fact, Mrs Dursley pretended she didn't have a sister, because not to long after the dead of her husband Mrs Potter had moved in with her girlfriend.
When she was still a teenager Mrs Dursley thought that her sisters bisexuality was just a phase and after all, didn't her marriage to this Mr Potter confirm this theory? The Dursleys knew that this marriage had resulted in the birth of a child but luckily they had never met the kid ..., or the girlfriend. They shuddered to think what their neighbours would say if they knew. Even though Mrs Dursley tried to think about her sister as little as possible, she sometimes couldn't help but wonder if perhaps wizards thought differently about this kind of inclination?!