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.

Happy birthday, sister. I can’t believe you wanted to marry into this wacky family. I guess you must be just as wacky as the rest of us! Best wishes on your birthday, sister-in-law.

Happy birthday. Happy birthday to the latest and greatest addition to the family! My brother sure knew what he was doing when he went for you. I’m so glad he made you my sister-in-law.

Happy birthday to the person who always steals my clothes. For my birthday, I'd like them back! I’m sorry I called you old. I really thought you knew…Happy birthday! Happy birthday to my sister. I ...

finding the right words to wish them a happy birthday is a top priority. Gift? Found it. Birthday dinner? Planned it. Card? Purchased. Finding something to write inside a best friend's birthday card? ...

Stuck on what to say? Here’s what to write in a birthday card for a friend, coworker or that special someone in your life. March 12, 2025, 9:37 AM PDT Sarah Lemire Lifestyle Reporter ...

It's your BFF's birthday, so give her a funny happy birthday card that will make her laugh. Here are 25 of the funniest happy birthday cards for your best friend's big day.

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.