birthday with heartfelt birthday wishes. Words of affection are known to have a positive effect on people. Finding the right birthday wishes for sister may not be as hard as you think you must think about what you really want to tell her Here are some wishes for your sister if you are feeling at a loss for words today.A sister is that person in your life who you know will always have your back no matter what. A younger sister will help you grow and mature in ways you know were possible Best Birthday Wishes For Sister