Commentaries:
Moses' solution to the problem became a judgment and is now part of the Bible. In such a case as with Zelophehad's daughters, they had to marry someone who was a Manassite if they wanted to hang on to the land. If they did not want the land, it would be given up according to the progression given in Numbers 27. They had to forfeit it, though, and it passed from their family altogether.
John W. Ritenbaugh
The Covenants, Grace, and Law (Part Seventeen)