People often make the mistake of thinking that Mothers Day cards are only for their own mothers, perhaps their mothers-in-law as well (though this is typically up to your spouse to take care of). On the contrary, Mother's Day is about celebrating mothers everywhere whether they are related to you or not. Take a few moments to think of all the moms that you know in your life and don't forget grandmothers, daughters, friends, aunts, or sisters. Recognizing these mothers on Mothers Day is just as important as sending your own mother a card. Mothers Day cards for your sister are a great way to not only renew that sisterly bond that is not so easily broken but also to connect in a different way. If you are a mother as well, then you are connecting with your sister as a mother, if you do not have children then you are connecting with her as the aunt or uncle to your niece or nephew. As we get older, it can be more difficult but increasingly important to take the time to recognize the people around us and the significant roles that they have within our lives, a simple card can accomplish this quite easily.