Answer in Details
No human, including priests, can absolutely predict what will happen in personal relationships. Instead of worrying about predictions, Lord Shiva encourages us to practice detachment (vairagya), trust in divine timing, and maintain faith. What is meant to happen will unfold as per the cosmic order (rita).
Therefore, focus on your devotion, support your sister with love, and leave the rest to Lord Shiva. Chanting his mantras, such as "Om Namah Shivaya," can help bring peace and clarity. Remember, Shiva teaches us to let go of fear and accept life’s changes with grace.