For a sister who is a best friend happy valentines wishes for you the years pass by much too quickly so many life changes come our way one thing i can always count on is that my sister is always there wishing you much love and happiness on valentines day and always growing up together creates a bond that never dies. Happy valentines day to one of the people i love most in the world my sister. Sending Valentine S Day Greeting Cards To Our Sisters Is Probably After mother sister is one of the most caring loving and kind people of the family.