What is God's wisdom in the imprisonment of my brother, and is it a punishment for a sin he committed, and how can that sin be known?

Allah Almighty created humans as a test and an trial. This world is a realm of tribulation through religious and predestined decrees, encompassing both good and evil. This is to distinguish the wicked from the good, to expiate sins, to elevate ranks, and to purify the believers. This world is not a realm of absolute recompense; complete justice will be in the hereafter, where the oppressed will receive their full rights, and the oppressor will be held accountable for their injustice.