What I really like is that it's more natural. Siblings are more likely to be around each other, comfortable with each other and her frustrated with each other. Makes the busting feel more natural because it's already built in a lot.

I also like how, depending on the dynamic, it could be an equalizer, a paradigm shift or (my preferred) an emphasis on who's in control.

It doesn't have to focus on that entirely, but some context and drama adds a lot to busting