How to Write a Wedding Card Welcoming Your New Son-in-Law

We're not just celebrating a wedding, but a new and wonderful family member.
Groom with mother-in-law
Photos: Getty, Stocksy,Graphic: Falak Khoja
emily rumsey the knot editor
by
Emily Rumsey
emily rumsey the knot editor
Emily Rumsey
Associate Commerce Editor
  • Emily helps maintain and update e-commerce content for The Knot
  • Before joining The Knot Worldwide, Emily worked as a website editor and manager for The Paleo Diet®
  • Emily holds two bachelor's degrees in Journalism and International Affairs with a Chinese minor
Updated Mar 11, 2025

Weddings are not just about two people joining their lives together. They're about uniting families. As a parent, this means accepting a new child-in-law with open arms. Welcoming your son-in-law to the family with a wedding card is a great way to set the tone for your future relationship. He'll be a part of holidays, vacations and all the cherished moments in between, so making him feel accepted is important. Plus, he'll truly appreciate the show of love and support on the big day itself. Don't let the task feel daunting. We know exactly what to write in a wedding card to help you warmly welcome a son-in-law into your life. (And if you're looking to pair those thoughtful words with a gift for your son-in-law, we've got you covered there too.)

In this article:

What to Write in a Wedding Card Welcoming Your Son-in-Law to the Family

If you're looking at that wedding card for your son-in-law and thinking there's a lot of blank space, don't worry. We're here to help you craft a heartfelt message that fills the page with sincerity and warmth. Start by expressing how thrilled you are to have him as part of your family. You can mention how, whether he's sharing a laugh or offering support, he brings a special energy that makes every gathering better and brighter.

Next, express your gratitude for the happiness he brings to your child's life and share your excitement for their future together. It's a beautiful moment to reflect on how wonderful it is to watch them build a life full of love and promise. Feel free to offer some words of wisdom or advice about marriage that will support their long-term journey as a couple.

End the message by offering your unwavering support and expressing your confidence not only in their future together, but in his special place within the family. This thoughtful sentiment will show him just how deeply he is valued and loved by everyone.

Messages to Welcome Your Son-in-Law to the Family

Wondering what to say to welcome a son-in-law into your family? You don't have to figure it out alone. Here are some ideas for welcoming a son-in-law to your family with a wedding card message you can copy word for word.

  • Today, we not only celebrate a wedding, but also the wonderful addition of a new family member.
  • It's a joy to see how happy you make our [son, daughter, child]. Knowing [he, she, they] has a partner as kind and loving as you puts our hearts at ease.
  • Welcome to the family! We are so happy to officially call you our son.
  • Wishing you both a lifetime of happiness, laughter and adventure. We are so lucky to call you our son-in-law.
  • You are now part of this loving, wonderful and sometimes crazy family. We couldn't be more thrilled to welcome you with open arms.
  • As you start this beautiful journey together, know that you have our full love and support.
  • From this day forward, you are part of our family. We look forward to all the wonderful memories we'll share.
  • We've had the pleasure of watching your love grow. Today, we celebrate your connection and commitment, as well as the new bond we now share as family.
  • From the moment we met you, we knew you were meant to be a part of our family. Welcome, son!
  • Thank you for being such a loving, supportive and caring partner to our [son, daughter, child].

Quotes to Welcome Your Son-in-Law to the Family

If you're still wondering what to write to welcome your son-in-law to the family, consider quoting a book, movie, TV show, song or celebrity. You can choose quotes that touch on marriage or, for a bit of humor, about the ups and downs of extended family. Yes, we're talking about you, in-laws!

  • "Being a part of this family means you are here for this family." —Abuelita, Coco
  • "Coming together is the beginning. Keeping together is progress. Working together is success."― Henry Ford
  • "The stress of making small talk with in-laws is called being part of a family." —Miss Manners, Judith Martin
  • "I promise not to interfere in your lives *all* the time." Robert De Niro as Jack Byrnes in Meet the Parents
  • "And they may not see each other for days, weeks, months or even years at a time. But if there's love, dear... those are the ties that bind. And you'll have a family in your heart forever."—Robin Williams as Mrs. Euphegenia Doubtfire in Mrs. Doubtfire
  • "A successful marriage requires falling in love many times, always with the same person."—Mignon McLaughlin
  • "The greatest marriages are built on teamwork. A mutual respect, a healthy dose of admiration and a never-ending portion of love and grace." —Fawn Weaver
  • "Ohana means family. Family means no one gets left behind or forgotten."—Stitch, Lilo & Stitch

Example Wedding Card Welcoming Your Son-in-Law to the Family

If you're welcoming a son-in-law to the family with a handwritten letter, feel free to use this example for inspiration.

Dear [Son-in-Law's Name],

I'm absolutely thrilled to welcome you into our family. From the moment I met you, I knew you were someone special. Your humor and sense of adventure fit right in with our family. You have a way of lifting the mood at every gathering, whether it's with your quick wit or your incredible cooking skills. From the very first holiday we shared, I knew [child name] couldn't let you—or your appetizers—go!

I'm so grateful for the love and happiness you bring to [child name]'s life. It fills my heart to see how beautifully you two complement each other, and I am excited to watch the future you build together unfold. Thank you for sharing in their dreams, supporting them in every endeavor and standing by them through it all.

As you begin this new chapter, remember that a strong marriage is built on trust, patience and the ability to find joy in even the smallest moments. Please know that I will always be here for both of you, cheering you on every step of the way. I couldn't be happier to have you as part of our family. I look forward to all the memories we'll continue to make together.

With love and warm wishes,

[Your name]

Up Next
  • Collage of four gift ideas for son-in-law: YETI mug, personalized cooler, pizza maker, indoor herb garden
    The 41 Best Gifts for Your Son-in-Law for Any Occasion