I've got a situation now where I have a rigidbody on the parent, and 5 children all have colliders. Previously, the parent did not have a rigidbody, but now I need it. I am using an OnCollision event, which used to give me the child's name, but now it rolls up to the parent's name. The parent has a different tag, but OnCollision doesn't care. So after clicking around for a while, I've come across the fact that this is the default function, I can understand that since in most cases you want to group some colliders for a parent. I have seen that something like this I could use:
myCollider = collision.contacts[0].thisCollider; // child collider
I was wondering if there is an action that exists to get this information before I tried to wire something up myself.