Birthday wishes for little sisters, sister-in-law, or anyone who feels like a sister make them feel loved and celebrated. Here: funny, heartwarming messages.

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.

Either way, it's time to wax poetic about your sis. From funny birthday captions to sweet ones, these birthday wishes for your older or younger sister are perfect.

Short, funny and thoughtful messages that would make the perfect birthday wish for your sister or sister-in-law this year.

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