'Ancestral' in the Bible
These were the ones chosen from the community, leaders of their ancestral tribes. They were the heads of the thousands of Israel.
"Send out men to investigate the land of Canaan, which I am giving to the Israelites. You are to send one man from each ancestral tribe, each one a leader among them."
The land must be divided by lot; and they will inherit in accordance with the names of their ancestral tribes.
You must divide the land by lot for an inheritance among your families. To a larger group you must give a larger inheritance, and to a smaller group you must give a smaller inheritance. Everyone's inheritance must be in the place where his lot falls. You must inherit according to your ancestral tribes.
And when the Jubilee of the Israelites is to take place, their inheritance will be added to the inheritance of the tribe into which they marry. So their inheritance will be taken away from the inheritance of our ancestral tribe."
In this way the inheritance of the Israelites will not be transferred from tribe to tribe. But every one of the Israelites must retain the ancestral heritage.