The youngest brother, Otto, died on 24 November 1632. On 11 December, Ernest Casimir came of age and the brothers decided to revise the division of the inheritance. In this new division, Ernest Casimir received the districts of Weilburg and Mehrenberg, the County of Gleiberg and the districts of Kirchheim and Stauf, which had been Otto's. The brothers decided to share the district of Usingen and Stockheim. In 1634 in Frankfurt, the brothers reached a compromise with the Lords of hohengeroldseck over the ownership of Lahr.
