node reference cck

Hello everybody.
Sorry if I ask something obvious but digging through the rule docbook and the group did not help me much.
I miss a documentation that goes beyond the "GUI" part but explains the mecanics and meaning of parameters of the most complex actions like "load node", "fill a cck field" and such.

What I need to do :
I have a content profile with an embedded node-reference toward another content type instance.
When the user create its profile, I want to silently create a new node of that type and assign it to the node reference in its content profile.

Hi.
Does there exist a tutorial about the CCK Node Reference fields?

I've created two content types, Father and Son. A Father can have many Sons.

I've added a new Node (Father) Reference field to Son.
I've also added an "Add new Son" link (node/add/son?field_father=123) when the user is on a Father-node page.

Now, I don't know how to autocomplete that Node Reference field with the nid of the Father node.

Could anyone help me?

I'll write a tutorial if it doesn't exist and I succeed to make this work.

Thanks anyway, Giovanni