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. A good welcome letter acts as a travel guidepointing members to key resources, highlighting benefits, and outlining simple next steps. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. Dear Daughterinlaw,. Today, you enter our home with new dreams and hope. An open letter to my future daughter in law. I knew when God gave me that precious little boy, the day would come when I would have to let him go.