Hi {Recipient},

Thank you for your apology. I'm sorry I {what you did to the other person}. Let's bury the hatchet and move on!

Take care,
{Your Name}

Dear {Recipient},

Thank you so much for the big welcome home. I wasn't expecting {a party/other unexpected detail/etc.}—thanks for putting that together. It feels great to be back!

Love,
{Your Name}

Dear Mr. and Mrs. {Surname},

Thank you for raising an amazing young man. {Boyfriend} impressed me with his incredible work ethic and sense of responsibility when I first met him—I knew that he had to have come from a wonderful family.

Speaking of, thank you for making me feel like a part of your family. Being included in family activities and gatherings means a lot to me. Thank you for taking care of me and making sure I eat well every time I come over.

Thanks for everything! I'm very happy to have met you both.

Yours respectfully,
{Your Name}

Dear {Parents of the Bride},

Thank you for welcoming me into your family. You have both been very kind and accepting since {bride} and I first started dating, and I was overjoyed when you gave your blessing for our marriage.

Thank you for raising the amazing woman whom I now call my wife. I promise to cherish her and take good care of her for as long as I live.

With love,
{Your Name}