We're so happy to welcome you to the family! A Welcome Letter to Future Daughter in Law can be filled with congratulations on her upcoming marriage and hope for the best.Write a letter to your future daughter-in-law to welcome her into your family, and assure her she already has a place in your hearts. You will always be the most important girl in Tyler's life which makes you very important to me. The day he proposed to you, you became family! A "thank you for joining" membership letter should include a personalized greeting to the new member. Use the member's first name in your salutation. Letter to my new daughter in law. Discover Pinterest's best ideas and inspiration for Letter to my new daughter in law. Do you want new ways to welcome members into your church?