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!We're so happy to welcome you to the 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. Dear Daughterinlaw,. Today, you enter our home with new dreams and hope. Here are 10 things your welcome letter or email to new members must include plus a template that can be customized for your organization. 1. Enter the date at the top of the letter. Paid Family Leave (P F L) provides up to eight weeks of partial-wage- replacement to eligible Californians who need time away from work to:.