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function Parent (name) {
  this.name = name || 'Adam';
  this.things = ['apple'];
}

Parent.prototype.getThingsList = function() {
  return this.things.join(', ');
};

function Child() {}

var parent = new Parent();

Child.prototype = parent;

var child = new Child();

console.log(parent.getThingsList());
console.log(child.getThingsList());
child.things.push('stick');
console.log(parent.getThingsList());
console.log(child.getThingsList());