Adam Clarke on Joshua 14:4

The children of Joseph were two tribes - This was ascertained by the prophetic declaration of their grandfather Jacob, Gen 48:5, Gen 48:6; and as Levi was taken out of the tribes for the service of the sanctuary, one of these sons of Joseph came in his place, and Joseph was treated as the first-born of Jacob, in the place of Reuben, who forfeited his right of primogeniture.

With their suburbs for their cattle - For the meaning of this passage the reader is referred to the note on Num 35:6.