Wish your sister or sister-in-law a happy birthday with our list of 100 birthday messages for sisters. From sentimental to funny, choose one to write in a card.

May all your birthday wishes come true. Happy birthday! Happiest of birthdays to the peanut butter to my jelly. I love you! I’ll always be your biggest fan in the world. Happy birthday, dear sister!

Bella Hadid Wishes Sister Gigi a Happy Birthday: 'My Most Favorite Chilling Partner' "I am always with you in spirit and your #1 cheerleader 365 days a year.

Brooklyn Beckham posted a "Happy Birthday' Instagram story of his sister, Harper Beckham, amid his issues with his family.

Birthday wishes for sisters, sister-in-law, or someone like a sister to you should make them feel loved and celebrated. Find funny, heartwarming messages here.

Will Smith Shares Family Photos to Send Birthday Wishes to His Twin Siblings Harry and Ellen: 'Love U' The actor's younger siblings, twins Harry and Ellen, turned 53 on May 5 By ...

Happy birthday to my person, my rock, my friend forever, and my sister. Words can’t accurately describe the love I have for you. Wishing you a birthday as wonderful as you are.