After Being Reborn in the Apocalypse to Stock up on Goods, I Traveled to Ancient Times

Two tragic deaths in the last days, hundreds of millions of orphans in the 21st century, traveling through the ancient times with space hoarding goods, and when they opened their eyes, their mother and father died suddenly, leaving behind a five-year-old brother and a newborn sister. Relying on their wisdom and brains, they made money to support their younger brothers and sisters, established a dynasty, solved the problem of survival, set up the first assembly line in ancient times, and led the people into the era of industrial technology.