Can I get a General Reading? Or Do I need to ask a specific question?

I believe you should state what it is you want to know about and if its about a person sometimes they like you to give the month, day, and year of birth.

Ok, Here goes...
I'm going to tell a story, and see if anyone can explain it to me.
I have this memory. I was in my parents car, my father was driving, and I was iin my mother's lap in the passenger seat. I was apparently too small to comprehend 'all' of their conversation, but I got some of it. They were talking about meeting my father's brother's and sisters for the 1st time. (he had been adopted as a child) Ok, next, we are at the door, I am in my mother's arms, my father knocks, and a girl comes to the door. I know she isn't grown, but she is much older than me. My father asks for 'someone', she says they aren't home, so he asks who else is there. She states another name, he asks to see that person. She, in turn brings a child to the door. He chuckles, and explains he needs to speak to an adult, and says he will return later. The girl closes the door and we walk away. My mother asks if maybe he should have told the girl who he was. He said no, that he didn't think that was a good idea. He needed to speak to an adult first. (Apparenly, it had been his sister).

Ok. Years later (for whatever reason) I mention this 'memory' to my mother. She looks at me with the blankest expression, and tells me that it is impossible that I remember that. When I ask her what was so impossible about remembering something from such a young age, she explains that it wasn't me in her arms that day. It was my sister, who died before I was born.

Any explanations?