Yes that was HER point. But what I read goes more like this: "My parents aborted my biological brother/sister so they could get to me." ....which simply prompted me to say how touching of a story that was.
And yes, that WAS a potential sibling. His/her DNA was all in place, as was that child's God-given spirit of life. Had this child been allowed to develop the author would have one more sibling alive today.