We're so happy to welcome you to the family! I wanted to share an open letter to my future daughter in law.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. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. New member welcome letters are the perfect way to introduce your organization, reiterate its values and mission, drum up excitement, and express your gratitude. Do you want new ways to welcome members into your church? Check out these top church membership welcome letter templates and best practices. Parents or legal guardians will need to provide the following documents: Proof of Residency in Fairfax County. An open letter to my future daughter in law.