Answer
Ka'iulani's royal uncle and aunt were King Kalākaua and Queen Liliʻuokalani, the reigning monarch and the heir presumptive of the Kingdom of Hawaii during Ka'iulani's life. King Kalākaua, Ka'iulani's great-uncle, played a pivotal role in modernizing Hawaii and was known for his efforts to preserve Hawaiian culture. Queen Liliʻuokalani, Ka'iulani's aunt, became the last reigning monarch of Hawaii before the kingdom's annexation by the United States.