Using morph sliders in Blender I have a character made of multiple meshes ( body, eyes, tongue, teeth). How can I make them all interact with the morphs that are on the body mesh ? 
Ex:
1) I have a morph that will make my character taller but when I use it the eyes, teeth and tongue don't move and end up where the neck is. 
2) I have a morph that will make the eyes bigger but when I use id the opening for the eyes get bigger but the eyes them self remain the same size
3) I open the mouth but the 2 meshes that make the teeth don't open.

Thank you
For shape keys, what you do is what you will get.

The only option is to join all the parts together before doing the morphing.

You will control the morphing using proportional editing