how to get signal from child widget

hello there,
I've got a question: I have a parent-vbox, and I add some child-widgets such as paned-box, label, entry, text-view in it. Now when one(it could be anyone) of the child-widgets get focus in, I wanna get the signal to handle something.
How should I do? Should I connect "focus-in" signal to every child-widget, or some better way? I tried to connect "focus-in" signal to the parent-vbox, but seems not work.

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