Dear [Name of Sister-in-law],
Happy birthday to my beautiful sister-in-law. Best wishes and congratulations on completing this important milestone of your life. Dear sister-in-law, my heartiest greetings on your 50th birthday! Along with my brother, you keep everyone happy and content in our family. I am really lucky to have such a kind and lovely sister-in-law like you. May God give you many more beautiful years to celebrate! It is not an ordinary day today; it is a day to celebrate for the subsistence of a lovely person. May your life always filled with lots of love and happiness be your daily companion!
All these years I have learnt a lot from you and you have been a guiding light throughout my life. It has been twenty five years since you came to our home yet it feels like yesterday. A friendly and pure person like you can be seldom found. Your optimistic approach towards love amazes me always. You are my best friend, secret keeper and partner in crime. Years have passed and I have realized that our life is incomplete without you. You are one of the most spectacular people I have ever met. I just can’t wait to come home and celebrate your birthday in a grand way. I am missing my favourite delicacies which you used to cook with so much love.
Happy half century birth anniversary my darling sister-in-law. Cheers on your special day! Have a blast.