How long has X known about Aylia being her cousin?  Well, probably not before Strip #29, and definitely not before Strip #15.  She probably did know by Strip #185, however, and she definitely knew before Strip #244.  She would have pieced it together gradually, keeping her mouth shut all the while, and probably being quietly amused over it.  This is what happens when you always attract strange roommates, and your relatives have a tendency to be strange!

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