{
     data : {
              "entityOne"   : Entity Representation of entity A,
              "entityTwo"   : Entity Representation of entity B
     },
     relationships : {
             "parenthood" : // Here I need to refer entityOne & entityTwo
                            // to express the notion of one being child of other
     }
   }

{
     data : {
              "entityOne"   : { "id" : "temp1" -- other data for type A }
              "entityTwo"   : { "id" : "temp2" -- other data for type B }
     },
     relationships : {
             "parenthood" :  {
                                "parent" : "temp1",
                                "child"  : "temp2"
              }
     }
   }