Final answer:
Tecumseh's brother, who shared the spiritual message that all Indian people are brothers and who urged a revival of native ways, was Tenskwatawa.
Step-by-step explanation:
The brother of Tecumseh, whose spiritual message emphasized that all Indian people are brothers and promoted a revival of native ways, was Tenskwatawa. Tenskwatawa, also known as the Prophet, encouraged Native Americans to reject Anglo-American culture and alcohol. At Prophetstown, he strove for an alliance of Indian tribes to resist American expansion and maintain indigenous cultural practices. His efforts, alongside his brother Tecumseh, contributed to tension with American settlers and the government represented by figures like William Henry Harrison. This culminated in the Battle of Tippecanoe in 1811, where Prophetstown was attacked and destroyed while Tecumseh was away. Tenskwatawa's defeat undermined his spiritual authority and resulted in the dispersal of his followers.