Children and Magic numbers

Right now Harry has two kids. Maggie is the child of his body. Bonea is the child of his mind. It seems fitting to me that he have a either a child of his soul/will or a child of his magic. (Although there's probably a question as to whether or not there's even a difference there). That way each 'part' of who he is would have a child. It would also give us that magic number 3.

Part of me kind of wants to try and expand it to be something like the Children of Harry's Past, Present, and Future. But I think that's probably stretching it too far.

I also don't think the long term prognosis of mom #3 is very good, considering how moms #1 and #2 both die