In-laws can be a quite the surprise. You may have chosen your own awesome partner, but their family can be an unknown. Often enough, they end up adding to your life and making it richer. On your sister-n-law's birthday, thank her for being a gift in your life that you didn't see coming, by sending the Mystery Gift Birthday Card.
Which is more important: presents or presence? By sending this precious gifts happy birthday card to your cherished sister-in-law you will be letting her know how much her presence in the extended family means to you! She's a gift that keeps on giving and you want her to accumulate many more joyful memories with all of you! Keep the good times rolling!