Funny Birthday Card for Sister to my favourite sst

*variable card Description Celebrate your sister’s special day with a fun and playful birthday card that’s guaranteed to make her smile! This colorful and bold design features cheerful bubble lettering that says “Happy Birthday to My Favourite Sister” with a humorous twist underneath: “(the fact you’re my only sister is irrelevant)”. It’s the ideal mix of sweet and silly — perfect for sisters who love a good laugh. Great for birthdays, parties, or just showing a little extra love, this card adds personality and charm to any celebration. Whether she’s your favourite (or your only!) sister, this card will make her day feel extra special.