I will say that I had a similar reaction when I saw my grandfather had a child before our current family and my first thought was to remove - but after digging in fairly deep and finding conclusive DNA evidence, it was clear she was his first child, born out of wedlock, and I needed to keep her on the tree. It led to lots of interesting clues that broke open a whole new family for me. So while this might not be nearly that interesting, I just thought I'd point out that there's always the outside chance that the original Profile Manager might have put that child in on purpose, or it could be a mistake. Just good to check all avenues to be safe.