Child Objects to moving background

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How do I…

Parent an object (pictured burnt trees) to a moving background?

What is the expected result

I want the trees to move at the same rate as the background image.

Explain what should happen when you run the game.
I want the trees to move at the same rate as the background image. I idea is to give the impression of movement.

What is the actual result

Currently I have programed the background to move. But obviously the trees are stationary.
(programming for the movement of the background.

Related screenshots

image
the dark blue is the background and the burnt tress are pretty self explanatory. They are individual instances.

You’ll need to change the x position of the burnt tree image the same time you change the background offset. Use the same amount as thebackground offet change (though I think you may have to use the negative value of it).

Something like: