His older brother Hans (c. 1363-1372) having predeceased their father, Hermann was the sole heir of their father upon the latter's death on 21 March 1385. The death of his son-less cousin William on 19 September 1392 made him the sole possessor of the family titles and estates.

Hermann II married Anna, daughter of Count Henry of Schaunberg and Ursula of Gorizia, in c. 1377. They had six children: Frederick