What to give your Big & Middle & Little Sis on sister birthday without making them jealous over one another's gift? You're on the hunt for sister gifts that are unique, meaningful, and most importantly, practical? Then personalized sisters coffee mugs for 3 sisters should be your #1 choice in your shopping list of unique birthday gifts for her. Giving each of your siblings a customized mug on which their beautiful personalization and lovey-dovey quote are printed will make the best gifts for sister ever.