Having a sister truly is a blessing from God, so let your sister know that you appreciate her role in your life. Thank God for allowing you to grow up with a great companion. The best way to raise your sister up is through prayer to Him, either alone or with her.

Our Father in heaven,

I'm so grateful for the sister you have given me. Though sometimes she's a rival, she is always a friend, a companion, a guide and guardian. Ever since our childhood, she always is by my side just like You. She’s someone with whom I could share all the joy and sorrows of life. The sense of loving and caring taught me to be a better human being. I pray that You continue to keep Your blessings over her. Help her out in times of trouble, and remind her that she is never alone. Guide her to her calling, as she has guided me on my own journey. I know that having a sister is not a privilege everyone gets to experience, and I thank you for choosing me to have the honor. Amen!