Recording events in aggregate root

[Bojan Vukasovic]

How can I record entities in AR (and do reply) when I have e.g. 3 levels deep entities? Example: AR -> Entity1 -> Entity2

class AR{

List<Entity1> e1;

void run (Command c){

  e1.get(c.id).do(c.a);

}

}

class Entity1{

Entity2 e2;

void do(Integer x){

  e2.do2(x+1);

}

}

class Entity2{

Integer y;

void do(Integer y){

  apply(Entity2Evented(y));  <---------- how to bubble this event to AR? How to reply it on reading from event store?

}

when(Entity2Evented e){

 this.y = e;

}

}