Birthday Card Messages for Your Sister

A sister's card is the one place you can be genuinely rude and genuinely soppy in the same three lines. These messages do both, so you can insult her properly and still mean it.

Bring up one thing from childhood she'd rather forget, then finish with something kind. That's the sibling card formula.

Funny messages for your sister

  • Happy birthday to my sister, the family's favourite, allegedly.
  • Another year older and still borrowing things you'll never return. Happy birthday.
  • Happy birthday. You were the annoying one and, in fairness, you still are.

Heartfelt messages for your sister

  • Happy birthday to the person who's known me longest and stayed anyway.
  • You're the first person I tell everything. Have a brilliant day.
  • Happy birthday, sis. Genuinely lucky to have you.

Birthday Card Messages for Your Sister

Rude and warm sister designs, printed and posted from the UK.

World's Best Sister certificate-style birthday card with an elegant classic border and decorative typography. Happy Birthday Card For The World's Best Sister £3.87 A fun certificate-style greeting card proclaiming World's Best Sister-in-Law from FeelGoodTimes. Happy Birthday Card For The World's Best Sister-in-Law £3.87

Gifts to send with the card

Add a candle or a pin badge and the card and present arrive together.

Star Trek Lapel Pin Badges (Set of 3) Star Trek Lapel Pin Badges (Set of 3) £7.49

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Frequently asked questions

What do you write in your sister's birthday card?

Insult her affectionately, reference something only the two of you remember, then say the nice thing at the end.