Manasseh was Joseph's son. Makir was Manasseh's son. Gilead was Makir's son. The leaders of Gilead's family went to talk to Moses and the leaders of tribes of Israel.
They said, "Sir, the Lord commanded us to get our land by throwing lots. And sir, the Lord commanded that the land of Zelophehad our brother be given to his daughters.
Maybe a man from one of the other tribes will marry one of Zelophehad's daughters. Will that land leave our family? Will the people of that other tribe get that land? Will we lose the land that we got by throwing lots?
People might sell their land, but in the Jubilee year, all of the land is returned to the tribe that really owns it. At that time who will get the land that belongs to Zelophehad's daughters? Will our tribe lose that land forever?"