Animate two layers along identical path I have made simple animation where a hand drags an item onto a page.  I wanted them to take a curved path so I have added a bezier curve to the path as shown below



This only effects one of the layers so I manually put the same curve into the second layer but it is not perfect.  I can see the hand and the contact us box move slightly differently.

How do I lock both layers on the exact same path?
You could Parent one layer to the other.  

This means that one layer controls the position/rotation/scale of the other layer.  

See https://helpx.adobe.com/after-effects/using/layer-properties.html#parent_and_child_layers
for more info.