Welcome to our forum.
There's a lot to learn here, and many people's stories to read. Visit our Life stories and blogs board
sometime if you haven't already. Also you can do a search (and a tag search) for "children," to learn more about that subject (in relation to poly).
Sounds like this is something that has always kind of been in your blood. I hope you will find Polyamory.com helpful, as I have. Glad to have you aboard.