Here a nice collection of beautiful anniversary message to sister and brother in law is given below:
1). I am sure God is proud today seeing your smiles and he proud of making you together as a nice couple. I wish you a very happy anniversary to you both and enjoy your life always together.
2). You both look perfect to each other and you handle your emotion together. Many love stories are made, but yours is the sweetest among all. Keep this love forever in your heart just like today. I wish you a very happy anniversary.
3). All say opposite things attract most and you together make it true today. the combination of clam and loud, logic and argue bring you close to each other. but the love are equal between you that make you a true couple of love. Happy anniversary to my sister and brother in law.
4). You stole my sister and make her your own and you keep her in your heart and never let her alone. I wish the love and trust you shared last forever in your life and you together enjoy your journey. happy anniversary.”
5). To my sister, I know your wish and I know everything you dream for your future. I am happy to see your dream come true. Push your imagination and dream of your future and together make it successful. Stay together and always. Happy anniversary to you both.
6). It is the celebration of your union and the celebration of your love. The anniversary is a way to recollect those past moments again and live it in your present. I wish lots of emotions, smiles and happiness you share with each other in the coming years. Happy anniversary.