Schrodinger object: WPF property will not bind / update unless I check its value on the code side?

Question

I have a Node object with a parent that I linked in my xaml, e.g.

<Label>
    <Hyperlink>
        <TextBlock Text="{Binding Path=Node.Parent.Name}"/>
    </Hyperlink>
</Label>

My ViewModel looks something like this:

public class NodeViewModel
{
    public Node Node { get; set; }

    public NodeViewModel(Node model)
    {
        Node = model;
        if(model.Parent != null) { } // Check if it null, then do nothing.
        // When the above line is commented out, my label displays nothing.
    }

}

Why is this when the if if statement is commented out, the label / text block is empty? Am I doing something wrong? Is my object both existing and not existing until I check if it is null?

Edit:
Remember, my Node class is pretty simple and implements INotifyPropertyChangedfor the Name property.

2nd Edit: Added my simple Node class.

[ImplementPropertyChanged] // From Fody.PropertyChanged
public class Node
{
    public int? ParentID { get; set; }
    public Node Parent { get; set; }
    public string Name { get; set; }

    public Node Node(Node p = null)
    {
        Parent = p;
    }
}

Answer 1

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Answer 2

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