I love this message, its fantastic, usually the younger sister copies the older one, for your older sister to copy you is a good thing. You should take it as a compliment, although i get the feeling your sister feels like she wants to be loved and cherished like you. When someone gets older the younger days can put a strain on them. I mean that younger days are always the best days, where everything in every aspect is much better. I would say take it on the chin and take it as a compliment.