how to access scripts in children

so how to access scripts in children dos anyone know in a child there is a script called enemy and in enemy there is a var called health anythone know how to change that from the parent

gameobject-->child-->script called enemy-->var in enemy called health

i just want the health = 100

There are a lot of ways to do this here are two:

Here is my preferred method (only if the script you are looking for occurs only once in the children)

enemy myscript = gameObject.GetComponentInChildren(); = 90;

This is a little bit more specific method (specifies the child gameobjects name)

enemy myscript = GameObject.Find("child").GetComponent(); = 90;

[Edited] to show symbols

Learn more here:

Accessing components - for scripts on the same object

Accessing game objects - for scripts on a different object

Or maybe slightly more relevant