AE: Parent Element to a point of a path?

I want to parent an element (pre-compose) to one of the points on a path.

Imagine a line that has two paths. I want to parent an object (say, a leaf) to the top point of the path. So if my path is to have a bounce effect (the point of the path will move to create the effect...), so will my leaf.

Ultimately, it should (the leaf) move the same as my bounce line's top point.

Thanks!