Birthday by Recipient

Birthday Wishes for a Son-in-Law or Daughter-in-Law: 45+ Messages

45+ birthday wishes for a son-in-law or daughter-in-law — warm, close and more formal versions, plus what to say about the grandchildren.

By Funtastic E Cards Editorial Team 4 min read

Colourful party balloons with trailing ribbons
Photo by Adi Goldstein on Unsplash

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Writing to a son-in-law or daughter-in-law means finding a register between family and formality — warm, but not pretending to a closeness that may still be building. Here are 45+ messages.

Send yours in a free birthday ecard.

Quick birthday wishes

  1. Happy birthday! Hope you have a wonderful day.
  2. Happy birthday! Wishing you a great year ahead.
  3. Happy birthday from us both. Enjoy your day.
  4. Wishing you a very happy birthday.
  5. Happy birthday! Hope you get thoroughly spoiled.
  6. Many happy returns! Have a lovely day.
  7. Happy birthday! With love from all of us.
  8. Wishing you a brilliant birthday.
  9. Happy birthday! Looking forward to celebrating with you.
  10. Have a wonderful birthday!
  11. Happy birthday! Thinking of you today.
  12. Happy birthday — enjoy every minute.

Warm messages

  1. Happy birthday! We are very glad you are part of this family.
  2. Happy birthday. Thank you for how happy you have made our daughter.
  3. Happy birthday! You have fitted into this family as though you were always in it.
  4. Happy birthday. We could not have hoped for better for our son.
  5. Happy birthday! Thank you for everything you do for them both.
  6. Happy birthday. You have been a wonderful addition to this family.
  7. Happy birthday! Genuinely lucky to have gained you.
  8. Happy birthday. Thank you for being such a good father to our grandchildren.
  9. Happy birthday! Thank you for being such a good mother to our grandchildren.
  10. Happy birthday. Very glad you are one of ours.

When you have become close

  1. Happy birthday! In-law on paper, family in practice.
  2. Happy birthday. You are the one I ring when I need something doing properly.
  3. Happy birthday! We stopped thinking of you as an in-law years ago.
  4. Happy birthday. Genuinely one of my favourite people in this family.
  5. Happy birthday! Thank you for the chats that go on far too long.
  6. Happy birthday. Grateful you came with the package.
  7. Happy birthday! Best addition this family has had.
  8. Happy birthday. You are stuck with us now, I am afraid.

№ 01Wordsmith

Message Generator

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When it is still more formal

  1. Happy birthday. Wishing you a lovely day and a good year ahead.
  2. Happy birthday! Hope the day is exactly as you would like it.
  3. Wishing you health and happiness in the year to come.
  4. Happy birthday! Thank you for everything you do for the family.
  5. Happy birthday. With warm wishes from us both.
  6. Wishing you a peaceful and happy birthday.
  7. Happy birthday! Hope you have a lovely celebration.
  8. Happy birthday, with best wishes for the year ahead.

Short messages

  1. Happy birthday!
  2. Have a wonderful day.
  3. Happy birthday from us both.
  4. Many happy returns!
  5. Wishing you a lovely day.
  6. Happy birthday — enjoy it!
  7. With love on your birthday.
  8. Have a great one!

How to write it

  1. Thank them for something about your child. Making your son or daughter happy is the thing worth naming.
  2. Match the actual closeness. Overclaimed warmth reads as awkward; a warm, polite card never does.
  3. Mention the grandchildren if there are any. Praising them as a parent lands better than praising them as a spouse.
  4. Sign from both of you. A joint card is the norm and avoids any suggestion one of you forgot.

Send it — and pair it with a gift

A free birthday ecard arrives on the day. See also birthday wishes for your mother-in-law and birthday wishes for your father-in-law:

Pair this with a gift

Ideas that suit the occasion, each linked to one product we picked. Prices and availability are set by Amazon and can change.

Birthday Gift Basket

Our pick: Happy Birthday spa gift basket with "Not a Day Over Fabulous" mug

Best for: Crowd-pleaser birthdays

Occasion: Birthday

Curated snacks, treats, or self-care — ideal pair for a birthday ecard.

  • Works for almost anyone
  • Arrives looking thoughtful
  • Variety of price points
  • Less personal than a custom gift
View on Amazon

Funny Mug

Our pick: Lumsburry build-on brick coffee mug

Best for: Coworkers, friends, family with a sense of humor

Occasion: Birthday

A fun mug pairs perfectly with a funny ecard for daily desk joy.

  • Affordable
  • Daily reminder of the joke
  • Mug count adds up over time
View on Amazon

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FAQ

What do you write in a birthday card for a son-in-law or daughter-in-law?

A warm wish plus thanks for something specific — usually how happy they have made your child, or how they are as a parent.

What if you are not especially close?

Keep it warm and simple. “Happy birthday! Hope you have a wonderful day” is entirely sufficient.

Should you call them family?

If it is true, yes — being explicitly counted as family is something in-laws often say they wanted to hear.

Can it be funny?

Gently, if you have that relationship. Avoid in-law jokes, which rarely land as affectionately as intended.

What is a good short message?

“Happy birthday! Hope you have a wonderful day.”

Should the card come from both parents?

Yes, signing jointly is the norm.