As others have said, it is not possible to directly lookup a parent from a nested child. All of the proposed solutions advise various different ways of referring back to the parent object or parent scope through an explicit variable name.
However, directly traversing up to the the parent object is possible if you employ recursive ES6 Proxies on the parent object.
I've written a library called ObservableSlim that, among other things, allows you to traverse up from a child object to the parent.
Here's a simple example (jsFiddle demo):
var test = {"hello":{"foo":{"bar":"world"}}};
var proxy = ObservableSlim.create(test, true, function() { return false });
function traverseUp(childObj) {
console.log(JSON.stringify(childObj.__getParent())); // returns test.hello: {"foo":{"bar":"world"}}
console.log(childObj.__getParent(2)); // attempts to traverse up two levels, returns undefined because test.hello does not have a parent object
};
traverseUp(proxy.hello.foo);