A sister is often your first friend and the person who knows you best. Her birthday card is a good place to tell her what she means to you, or to remind her of that time you both got in trouble.
Here are happy birthday sister messages you can write in her card: short and sweet, funny, from a brother, for a twin, and for older sisters, younger sisters, sisters-in-law and sisters who live far away.
Article contents
- How to Write a Birthday Card for Your Sister
- Short Happy Birthday Sister Messages
- Sweet Birthday Wishes for Sister
- Funny Birthday Wishes for Sister
- Birthday Wishes for an Older Sister
- Birthday Wishes for a Younger Sister
- Birthday Wishes for Sister From a Brother
- Birthday Wishes for a Twin Sister
- Birthday Wishes for Sister-in-Law
- Birthday Wishes for a Sister Far Away
- Religious Birthday Wishes for Sister
- Frequently Asked Questions
How to Write a Birthday Card for Your Sister
Keep it simple.
- Start with "Happy birthday" and her name or nickname.
- Add one line about what she means to you.
- Mention a memory or an inside joke.
- Close with love.
Example: "Happy birthday, Katie! You are still the first person I call with good news. Remember the summer we tried to dye our hair with Kool-Aid? I would do it all again. Love you, Sam"
Short Happy Birthday Sister Messages
These fit a small card or the line under a longer note.
- Happy birthday, sister!
- Happy birthday to my favorite sister.
- Happy birthday, sis. Love you always.
- Cheers to you, sister. Happy birthday.
- Happy birthday to my built-in best friend.
- Happy birthday, sister. Here is to your best year yet.
- Happy birthday to the best sister in the world.
- Happy birthday, sis. Cake is on me.
- Happy birthday to my sister and my favorite person to call.
- Happy birthday, sister. I am so proud of you.
- Happy birthday! Sisters forever.
- Wishing my sister a very happy birthday.
Sweet Birthday Wishes for Sister
- Happy birthday to my sister and my best friend.
- I am so lucky to have you as my sister. Happy birthday!
- Happy birthday to the person who knows all my secrets and loves me anyway.
- You make every year better. Have the happiest birthday, sis.
- Wishing my wonderful sister a year full of good things.
- Growing up with you was the best part of my childhood. Happy birthday.
- Happy birthday to the kindest, funniest and strongest woman I know.
- No matter how old we get, you will always be my favorite person to laugh with.
- Thank you for always being in my corner. Happy birthday, sister.
- Here is to you, today and every day. Happy birthday!
Funny Birthday Wishes for Sister
- Happy birthday to my sister. Thank you for not telling Mom most of what you know.
- You are not getting older. You are just getting closer to my age.
- Happy birthday! I got you the best gift of all: me as your sibling.
- Happy birthday to the one who stole my clothes for years. You can keep the sweater.
- Sisters are like wine. You get better with age, and so do I.
- Happy birthday! I would say you are my favorite sister, but you already know that.
- Thanks for sharing your parents with me. Happy birthday!
- Happy birthday. Your present is that I will not post that photo from high school.
Birthday Wishes for an Older Sister
- Happy birthday to the sister who showed me the way.
- You were my first role model, and you still are. Happy birthday.
- Thank you for looking out for me all these years. Happy birthday, big sis.
- Happy birthday to the one who taught me everything, including how to sneak back in the house.
- I will always look up to you, even now that I am taller.
Birthday Wishes for a Younger Sister
- Happy birthday to my little sister. I am so proud of the woman you have become.
- You will always be my baby sister, no matter how old you are.
- Happy birthday, kiddo. Watching you grow up has been one of my favorite things.
- To my little sister: dream big, and know I am always cheering for you.
- Happy birthday to the little sister who became one of my best friends.
Birthday Wishes for Sister From a Brother
- Happy birthday, sis. I may not say it often, but you are one of the best people I know.
- Happy birthday to my sister. Thanks for looking out for your little brother all these years.
- Happy birthday to the sister who covered for me more times than I can count.
- I am proud to be your brother. Happy birthday.
- Happy birthday, sis. Call me if anyone gives you trouble this year.
- Happy birthday to my sister. You were right about most things, and I will only say that once.
Birthday Wishes for a Twin Sister
- Happy birthday to us, and especially to you.
- Happy birthday to my twin, my first friend and my favorite person.
- We have shared every birthday, and I would not trade one. Happy birthday, sis.
- Happy birthday to the better-looking twin. It was a close call.
- Happy birthday to my other half. Here is to many more together.
Birthday Wishes for Sister-in-Law
- Happy birthday to the best sister-in-law. I am so glad you are part of our family.
- I did not just gain a sister-in-law. I gained a sister. Happy birthday!
- Wishing a wonderful birthday to a wonderful sister-in-law.
- Happy birthday! Thank you for putting up with my brother. You deserve a medal.
- Our family is better with you in it. Have a great birthday.
Birthday Wishes for a Sister Far Away
- Wish I could celebrate with you today. Sending hugs across the miles.
- Distance means nothing when it comes to sisters. Happy birthday.
- I miss you every day, and even more on your birthday. Let us plan a visit soon.
- Happy birthday! Save me a piece of cake, even if it takes me a month to get there.
- You are far away but always close to my heart. Happy birthday, sis.
Religious Birthday Wishes for Sister
- Happy birthday, sister. I thank God for you every day.
- May the Lord bless you and keep you this year and always.
- Praying that this year brings you joy, peace and many blessings.
- God gave me a gift when He gave me you. Happy birthday.
Frequently Asked Questions
What should I write in my sister's birthday card?
Start with a happy birthday wish, add a line about what she means to you, and include a memory or inside joke. A few sentences is plenty.
How do I make a birthday card for my sister funny without being mean?
Tease about shared childhood moments, not about her age or looks in a way that could sting. End with a warm line so she knows you mean it with love.
How should I sign a birthday card to my sister?
"Love," "Love you, sis," "Your favorite sibling," or "Always your sister" all work.
Need more ideas? See our guide to what to write in a birthday card or use the Message Finder.
Our Happy Birthday Assorted Cards have twelve different designs and are blank inside. See all birthday cards.
Birthday wishes by who you are writing to: Mom, Dad, your husband, your wife, your brother, your son, your daughter, a cousin, an aunt or uncle, a niece or nephew, in-laws, Grandma, Grandpa, grandchildren and a friend.
