Dear [Name of Sister-in-law],
Happy birthday dear sister-in-law. Congratulations on successfully completing another year of life. I am extremely lucky to have you in my life. May you be surrounded by family, friends and your loved ones in every walk of life. Dear little sister-in-law, I have a perfect companion and friend within you. You have become an imperative part of my heart and life. Your presence makes my life so beautiful. I always cherished for a sister and God fulfilled my wish by sending you into my life.
Birthdays are special days but today are more special as you have entered the silver jubilee year of your life. I wish your every dream comes true. Never miss any chance to gain success and be happy. I pray to God to give you the strength to deal with every situation in life with confidence and power. Always be happy and cheerful as you are, for the rest of your lives. A person so pure at heart, can hardly be found and you are one of them. You are a perfect combination of beauty with brains. May God keep you away from evil eyes and shower his blessings upon you. Never change your positive and never give up attitude towards life. You illuminate our lives each day. You are a blessing in disguise. Cheers to the loving heart and caring natured girl.
Congratulations on your twenty fifth birth anniversary darling sister-in-law. Enjoy your day. Loads of love.