- tbf
- group birthday card
- Sister in law birthday
Sister in law birthday.
What to write.
Use her name, say one true thing about her, and wish her a good day. That is all a birthday card needs.
The wishes below are sorted by who is signing, so pick your group and sign it.
Create a cardRead a sample card
Everyone's words in one card.
Updated

Happy birthday. You are more fun than most people I actually chose.
Happy birthday. I am lucky, and I know it.
We could not have picked better ourselves. Happy birthday.
The question
Each writer gets a question.
One at a time, about Sam. They answer in their own words, or write without one.
- Something Sam did this year that you still think about.
- Words of Sam's that you have caught yourself using.
- A day Sam made better just by turning up.
- Something Sam taught you without meaning to.
- A small thing about Sam that nobody else would notice.
- The story about Sam you tell most.
- The moment you knew you had a proper friend in Sam.
- Something Sam did that only a friend would.
- A thing you still laugh about together.
- The time Sam turned up when it mattered.
- Something Sam knew about you before you said it.
- Something Sam did for the family that went unsaid.
- A habit of Sam's that you have caught yourself copying.
- A memory of Sam from when you were younger.
- Something Sam put up with from you.
- Something Sam taught you, mostly by example.
- A small thing Sam did that you noticed and never mentioned.
- The moment you knew.
- Something Sam did this year that made things easier for you.
- A thing about Sam you would not change.
- Something Sam carried that was yours to carry.
- The thing you go to Sam for.
- Something you picked up from working beside Sam.
- A bad day at work that Sam turned round.
- Something a new starter should be told about Sam.
- Something Sam did that made the job feel worth doing.
Or write without one.
Birthday wishes for your sister in law
Pick the group that fits, swap in her name, and sign.
From a brother or sister
Happy birthday. You put up with a lot from this family and you never once complained.
The best thing my sibling ever did was bring you in. Happy birthday.
Happy birthday. You are more fun than most people I actually chose.
You have been one of us long enough that I forget you had a choice in the matter. Happy birthday.
Happy birthday. You make the big dinners better and the hard days easier.
From a husband or wife
Happy birthday to the person who makes this family louder and better.
You are brilliant at this and you make it look easy. Happy birthday.
Happy birthday. I am lucky, and I know it.
Every birthday I think the same thing: good call, marrying into this lot. Happy birthday.
From the whole family
Happy birthday from all of us. We are glad you are one of us.
We could not have picked better ourselves. Happy birthday.
Happy birthday. The house is always better when you are in it.
From the whole family: thank you for everything you do and happy birthday.
Happy birthday. The kids say they love you best but we are not taking it personally.
Funny
Happy birthday. You married into this family anyway, so you are either very brave or very patient.
Happy birthday. You are officially the favourite in-law. Do not tell the others.
Another year of putting up with us. Happy birthday and thank you for your service.
Happy birthday. We will try to behave today. No promises after cake.
Short
Happy birthday. So glad you are part of this family.
Have a wonderful day. Happy birthday.
Happy birthday from all of us.
Wishing you a brilliant day. Happy birthday.
Happy birthday. Hope it is exactly what you wanted.
What to leave out
Do not write about how she joined the family or reference the wedding unless you know she loves that story. It can read as a reminder that she was not always there.
Do not make jokes about in-law dynamics. Even a light one lands wrong in ink.
Do not write a long message about what family means. Say one true thing about her specifically and stop there.
Do not guess at her age or make the number the joke. If the milestone is not the point of this card, leave it out.
One card from the whole family
Everyone signs from one link, and it opens for her on the morning of her birthday.
- 01
Set her birthday.
The card opens that morning. Nobody sees it before she does.
- 02
Send the link to the family.
Each person writes their own message and signs their name. One browser, no app.
- 03
She reads it on the day.
Every message in one place, signed by everyone who loves her.
Questions
What do you write in a birthday card for a sister in law?
She came into the family through someone else's choice, so the card is your chance to say you are glad she did. Name one thing she actually does and sign it.
Should I write something funny or something sincere?
If you have been making each other laugh for years, the joke fits. If the relationship is newer or sits warmer than funny, say what she brings to the family.
Can the whole family sign one birthday card?
Yes. On tbf, one card goes to the whole family, each person signs from a link, and it opens for her on her birthday.
Somebody has a day coming up.
Everyone's words in one card.