Hi and welcome to the forum!
It is my understanding that you are trying to achieve the impossible. If the parent is deactivated, it takes the child with it. The child can still be enabled or disabled and this dictates what state it will be in when the parent is enabled, but as long as the parent is disabled so is the child, in my somewhat limited experience.
What is your end goal, (gameplay element wise and generally or something) that you are trying to achieve and is there any specific reasons why you are trying to do it this way? I can try to help figure out a work around so you achieve the desired end effect.
Good luck with it!