Cancelling parent scaling in child

Any tips on getting a child to cancel out the scaling of its parent?  The parent in this case scales X and Y differently, And I can't figure out how to anti-scale the child so it doesn't stretch.

On the child, I'm trying to do an inverse proportion. (But this obviously applies it to both X and Y the same). Not sure sure how to call specific X or Y scale.

s = thisComp.layer("Parent").transform.scale;

[(1/s)]

Is giving me a scalar error (?)