How to fetch name of parent of a textbox?

I want to make fill color of a text box based on expression. If the parent value of textbox is xyz then it should be filled with some specific color.

One more issue is, it should fetch me.parent (like me.value) as I need this as a generic code.

Please reply if there is a way around.

In short I want to achieve below expression for fill color property of textbox :

=iif(me.parent=xyz,"red","black")