Happy birthday to the sister who stole all my clothes.
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More sister captions
See allSisters: the family you get to keep forever.
Double trouble.
Sister, confidante, co-conspirator.
Same laugh, same bad jokes.
Always looking out for my little sister.
Always there for my big sister.
Sister date day.
My sister is my favourite weirdo.
Sisters make everything better.
Big sister energy.
Happy birthday, sis! You're my favourite sibling. Don't tell the others.
My sister is my safe place.
Sister squad.
My sister gets me like no one else.
Sisters by blood, friends by heart.