fascinating idea...don't know why i haven't seen these replies before today.
there are established scales for AP.
leigh bar-yakov tested an AP inventory and had good results. i am using her scale in my thesis.
rebecca, you garner some funds and i am so ready to work on your idea! i have 1500 responses from self-selected american families, a few hundred of which have already agreed to be followed longitudinally. i gathered their data in 2002. you'd be welcome to use some of my conclusions/data in your grant proposal to demonstrate the need for this kind of research!
did you know there is nothing in the published literature re: AP families/children? only dissertations!