A sister is not merely family; she is a best friend, confidante, and guiding star in our existence. Her birthday is the right ...

Keep bringing joy to all those around you. Happy birthday, sister-in-law! When you blow out your candles, I hope that all your wishes and dreams come true. Happy birthday, sissy! When times are ...

Do happy birthday wishes for your sister have you scratching your head? She’s your best friend. Your partner in crime. Your ...

Ahead, find thoughtful, funny, and inspirational birthday wishes for any sister in your life. Happy birthday to my built-in best friend. You are undoubtedly one of the best people I know ...

That’s why it’s so important to find the right birthday wishes for sister—to let her know you care. Ahead, find the best birthday wishes for your sister that will make her feel great about ...

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 to ...

Give your brother or sister a special birthday wish to express your love for them. 88. Happy birthday to a fabulous [brother/sister]. I can’t picture my life without you and am so glad you’re ...

Despite how cold and formal the “sister-in-law” title ... steal any of the lovely little messages we’ve got down below. (And tell your girl we said happy birthday!) ...