How would you approach a situation where the grandparent component needs to subscribe to events from the grandchild component, but you want to uniquely identify the events so that only that one particular instance of the grandparent component subscribes.

For example: a form component has some number of input element children, all of which can trigger events the form wants to subscribe to. You only want this instance of the form to respond to only the events dispatched by the inputs that are descendants of the form.

Is there something you could add to that event that would let the subscriber distinguish that the element is one of its children?