Om Sai Ram.
Geeta ji, we share your pain and grief at the passing away of your brother. We don't know why things happen in life as they do. But we know for sure that our Sai Baba, the loving and merciful one, could not have snatched away your brother as you seem to think. Please remember Baba's words in Shri Sai Satcharitra whereby He talked about not having caused the death of the only son of Saptnekar. He taught us that everything happens as per our own karma that are accumulated over many births. So, why label the Master as a 'sadist', and incur sin of speech. Many of us, including me, have our share of irreparable losses of dear ones. But we choose not to talk ill of Baba and blame Him. Instead, we hold our karma responsible for our misfortunes. Kindly pray to Baba for forgiveness and seek His refuge. I can say from my personal experiences that He will bring you peace amidst your suffering.
Om Sai Ram.