My dearest love, on your special day I just want to wish you the happiest birthday possible and the same amount of happiness that you bring me every day.
My beautiful sister, you have a heart of gold and a soul so sweet that it’s only right you have the most magnificent birthday this year. Happy birthday to you.
On your special day this year, I am praying that the angels from the heavens above bless your new age with happiness and joy. Happiest of birthdays to you.
However much we see each other as the years pass, know that I cherish our moments together and you’ll always be a very special sister-in-law to me. Happy birthday, dear.