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Background information:
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If there are PAGE A, B, C and D. They have one common "relationship", which is "child of".
For example,
Page D: [[Child of: Page C]]
Page C: [[Child of: Page B]]
Page B: [[Child of: Page A]]
Page A: [[Child of: ]]
PS: assuming the user only assigns one parent to one page.
 
When the users are viewing Page D, I would to show the following information:
 
Page A> PageB> PageC> Page D
 
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My Question:
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Is there such extension already? If not, where is the proper location or point I should try to make this work? Any suggestion?