3 sisters are amazing, and I'm not saying that because I'm one (although my brother would agree, right? RIGHT?). There's something about having sisters that can't be duplicated in any relationship! With your sister birthday is coming up, this is the perfect time to earn some brownie sister points with amazing gifts for sisters. But in the endless list of unique birthday gifts for her, which one is the winner? Let's give a round of applause to personalized mugs for 3 sisters. With gorgeous and unique personalization and affordable prices, these custom cups for sisters can beat all competitors in the battle of the best sister gifts!