Dynamic hasMany relationship in Laravel/Eloquent

I want to have a dynamic relationship based on a class name, which is stored as a property on a far related model.

There are lots of different class names so I don't want to make lots of relationships. It's a bit complicated but it has to be this way.

function grandchildren() {    
    $className = $this->parent->grandparent->class_name;
    return $this->hasMany($class)->orderBy('value');
}

The problem is this trying to do it this way won't work mid query because it doesn't always have the 'child' model information yet (as ->get() hasn't been run). Another issue with this, it's it's running the same $this->parent->grandparent query every time - not ideal.

Before I start the relationship query, I can run this to get the class name and table name respectively:

$className = $parentModel->grandparent->class_name;
$tableName = ( new $className )->getTable();

But how to feed this into the relationship I'm not yet sure:

$parent->child()->with('grandchildren')->get();

Without creating a lot of relationships for each possible class, how do I feed the $className in to create a dynamic hasMany relationship, or can I do this by adding a new query scope and feeding in the $tableName or $className that way?

I hope this makes sense - thanks in advance for any assistance.

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