Now Joshua was old and advanced in years when the LORD said to him, “You are old and advanced in years, and very much of the land remains to be possessed. This is the land that remains: all the regions of the Philistines and all those of the Geshurites; from the Shihor which is east of Egypt, even as far as the border of Ekron to the north (it is counted as Canaanite); the five lords of the Philistines: the Gazite, the Ashdodite, the Ashkelonite, the Gittite, the Ekronite; and the Avvite to the south, all the land of the Canaanite, and Mearah that belongs to the Sidonians, as far as Aphek, to the border of the Amorite; and the land of the Gebalite, and all of Lebanon, toward the east, from Baal-gad below Mount Hermon as far as Lebo-hamath. All the inhabitants of the hill country from Lebanon as far as Misrephoth-maim, all the Sidonians, I will drive them out from before the sons of Israel; only allot it to Israel for an inheritance as I have commanded you. Now therefore, apportion this land for an inheritance to the nine tribes and the half-tribe of Manasseh.”
With the other half-tribe, the Reubenites and the Gadites received their inheritance which Moses gave them beyond the Jordan to the east, just as Moses the servant of the LORD gave to them; from Aroer, which is on the edge of the valley of the Arnon, with the city which is in the middle of the valley, and all the plain of Medeba, as far as Dibon; and all the cities of Sihon king of the Amorites, who reigned in Heshbon, as far as the border of the sons of Ammon; and Gilead, and the territory of the Geshurites and Maacathites, and all Mount Hermon, and all Bashan as far as Salecah; all the kingdom of Og in Bashan, who reigned in Ashtaroth and in Edrei (he alone was left of the remnant of the Rephaim); for Moses struck them and dispossessed them. But the sons of Israel did not dispossess the Geshurites or the Maacathites; for Geshur and Maacath live among Israel until this day. Only to the tribe of Levi he did not give an inheritance; the offerings by fire to the LORD, the God of Israel, are their inheritance, as He spoke to him.
So Moses gave an inheritance to the tribe of the sons of Reuben according to their families.