The answer
Numbers 16:27 states, "So they got away from around the tents of Korah, Dathan, and Abiram; and Dathan and Abiram came out and stood at the door of their tents, with their wives, their sons, and their little children."Only the sons and the little ones of Dathan and Abiram are mentioned; but not the children of Korah. They therefore escaped, while those of Dathan and Abiram perished with their fathers.
Answered by His Eminence Metropolitan Youssef (opens in a new tab)