Door collision not working | Change child- & parent objects code-wise

[Chikai]

Hey devs!

Game concept
On my topdown zombie game I'm trying to create doors for the players to open. Ones the doors are open there should be no collision, ones the doors are closed there should be collisions. I'm stuck on this because I can't change object parents and childs code-wise.

How it works:
The player collides with oSolid (and child-objects of oSolid). oDoor is oSolid except if it's open (a variable shows if it's open or closed).

The problem:
I want to change the child-objects of oSolid. When the door is open it should not be a child of oSolid, when it's closed it should be a child object. That way the player collides with the door if it's closed and ones it's open the player can pass through. Unfortunately I can't find a way to do this.
Do you guys know how I can fix this or if there's a better way to do this?

Thanks in advance!
~ Jochum

[Chikai]

Here is the code of the door object (parented to oSolid):

[Create]
image_speed = 0;
price = 1;

[Step]
//Change image based on variable
if (state == 0) {
image_index = 0;
} else {
image_index = 1;
}

[Left Pressed]
//Change state on click
if (price <= global.money) {
if (state == 0) {
global.money -= price;
state = 1;
}}

[maras]

You can't change parents ingame. Change the door instead
Once you collide with a door check if the door is open. If it's closed collide with it the same way as with oSolid