Linking objects X and Y

Hi
For a game for school I need 2 (or 3) objects linked so that one is moved the other one/two is/are moved too.
I tried a while to get it to work, but failed I can get the second to move when the first moves, but the first won't move when the second moved

Could anyone help me ?

The 2 (or 3) objects should always have the same x and y, z should not change. When one is moved the other should move too and if one can't move (if it is blocked by other objects or something) neither should be movable.

Anyone any idea how to do this ?

Thanks !
-Pablo

 

You might be able to get by with using transform.parent, that will link the objects together. Otherwise you might be stuck getting your hands dirty scripting it.

 

Yea, I was thinking something like that too

But I tried to make one of the 2 objects a child of the other, and then when I move the parant the child moves too. Though when you move the child the parent doesn't (which is normal). So I wrote a script:

but whit that the parent just flies away and the child stays on world 0,0,z (the childs y changes to the negate of the parent's y so that it's world y is 0).
Any idea why that is ?

Thanks !