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How would I do child > parent relative rotation without using a container?

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In that fiddle I want the green rectangle sprite to always be in the top right corner of the parent as they rotate. I know I can solve this by using a parent container but I want to do this without a container, I know it's something to do with setting the child's anchor and pivot correctly relative to the parent, but I can not for the life of me figure out how to do it properly.

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Am sure you will not keep your variable hard coded like this , but basic math operations from rotations should do the jobs !

 childRect.rotation = -newRotation/newRotation-0.5;

for this demo is work, in a complexe case you will need make more solide math algo.

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