Hello there,
recently someone ask how to animate thing like this . So I wrote script which simplifies this kind of animation.
Download here:
http://uloz.to/xgp17H2G/multiparent-zip
nebo
http://www.4shared.com/zip/MqwiOuUt/multiParent_1.html
Watch video here:
http://www.youtube.com/watch?v=5Oip-YiKuik&feature=youtu.be
It need few major tweaks but it is usable.
So I hope you will find it usefull 
If you are interested in math behind, please have a look here http://tomsmathjourneys.blogspot.cz/