You’re so much more than just a sister-in-law to me! I hope you have the happiest birthday, my true sister!
In you, I found the most fabulous sister and greatest friend possible. Happy birthday, my dear sister-in-law!
Happy birthday, my dear sweet sister-in-law! I truly believe that we would have a very special bond and a...
Happy birthday to the prettiest, most stunning sister-in-law ever! Your beauty is enchanting, my dear!