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Because spending time with the women you love the most might not be possible this Mother's Day, sending a small token of appreciation is more important than ever. And while we can't deny this annual holiday is certainly all about you, there are often a few other moms in your life you need to celebrate, as well — and your sister is definitely one of them! So where exactly should you begin? With a one-of-a-kind card, of course! Read on to catch of glimpse of some of our favourite designs that will surely put a smile on her face, even though you can't be together.