Disable a specific child's renderer through code on perent

Lets say you have a GM gameobject, and his 2 childs are “TunnelYellow” and “TunnelBlue”
i want to disable Yellow and enable Blue at the same time.
How do i disable only Yellow’s renederer using code (C#) through the GM object (their perent)?

Thanks in advance!

Use transform.Find(“name”) to get a child with specific name from a parent and use its renderer to enable or disable it.

Use something like this

void EnableYellow()
{
   transform.Find("TunnelYellow").renderer.enabled=true;
   transform.Find("TunnelBlue").renderer.enabled=false;
}
    
void EnableBlue()
{
   transform.Find("TunnelBlue").renderer.enabled=true;
   transform.Find("TunnelYellow").renderer.enabled=false;
}

Calling EnableYellow() will enable yellow tunnel and automatically disable blue tunnel and calling function EnableBlue will do the opposite