Some children are abused or neglected by one of the parents because they resemble or act like their partner (current or ex) or remind them of some unpleasant event. Or purposely lash out at the other parent’s favorite as a way of punishment by proxy. Sometimes children play the same card by saying they love Mom or Dad more, especially those torn by pending or actual divorce.
My second sister, was always treated differently than my siblings and myself. As we reunited during the last years of my Mom’s life and we began to reminisce, I talked about things that I thought everyone heard or knew. As we began to discuss why my Mom treated my sister differently (they had a mild love/hate relationship), I casually mentioned it may be because her nickname (a shortened version of her full name) was the same as my Dad’s ex-girlfriend. Everyone was shocked as they thought my Mom was my Dad’s first love (they both confirmed he actively pursued her, but she said that his best friend was also interested in her). While it may seem odd to pick a name similar (possibly the same full name) as an ex, my brother is named after my Dad’s best friend. The funny thing is, when they got into a fight, my Mom would tell her (and only her) “I should have left you in the trash where I found you!”. When I was young and naive, I asked my Mom several times, even when she wasn’t mad if she really found my sister in the trash and she would confirm it with a smile.
BTW, she’s definitely my real sister as she looks like my brother, who in turn looks exactly like my Dad. Unleeeeessss.
We’ll never know the truth since both my parents have passed away as well as almost anyone who knew them back then.