Quote - Still wondering if these rules would apply to a girl?

Not picking a fight, just saying.  I read what you posted before about gender and society but, since you posted this right after I posed my Rule 1, I will just say:  My rules apply regardless of gender.  If the OP was asking about a younger sister, most if not all of the advice given here would still apply.  Might it have been written / directed differently?  Maybe, but the question posed by the thread title is gender neutral; it is the gender of the specific younger sibling that makes you wonder about our assumptions and direction of the responses.  Forest for the trees, perhaps. :)