Basic question about jQuery OOP

Basic question about jQuery OOP

I just decided to use OOP in a project I'm working on. And I had a basic question about reaching properties in the root of the prototype from functions that lie within objects.

Heres a JSFiddle:  http://jsfiddle.net/454onwr3/1/ (Open console)

Heres the jQuery:
  2. var Person = function(first, last){
  3.     this._first = first;
  4.   this._last = last;
  5. };

  7. Person.prototype = {
  8.     full: function(){
  9.     return this._first +' '+this._last;
  10.     },
  11.     first: function( ){
  12.         return this._first;
  13.     },
  14.     last: function(){
  15.         return this._last;
  16.     },
  17.     hobbies: {
  18.         computers: {
  19.         init: function(){
  20.             console.debug(this._first +' '+this._last + ' likes Computers');
  21.             }
  22.         },
  23.         cars: {
  24.         init: function(){
  25.             console.debug(this._first +' '+this._last + ' likes Cars');
  26.             }
  27.         }
  28.     }
  29. };

  31. var p1 = new Person('John','Doe');
  32. p1.hobbies.computers.init();

  34. var p2 = new Person('Jack','Black');
  35. p2.hobbies.cars.init();


Basically, if I wanted to call elements deeper within the object than just the first level, how can I reach properties stored in the root? Those console outputs should say "John Doe likes Computers" and "Jack Black likes Cars". Ive been reading a few jQuery OOP Articles, mainly this one and this one.

Thanks!