Nothing seems to suggest in game dialogue or historically Radzig was anything less than a lord. He builds his own castle in 1412. Sadly for henry he does have children and a wife historically, at what age when certain things happen in 1416 relating to the heretical teachings of Janus Hus occur a cursory google search doesn’t say but not old enough to not be placed under wardship of a couple of knights and for said castle to end up ceded to a hussite nobleman by his widow. Henry during the time of these problems would be well into his 30’s though and the issues present in game a distant memory.
It would be interesting, if the game is a direct continuation, maybe with you playing as Henry and teresa’s kid and Your father being a open secret and problem solver of the burgrave of Vyšehrad, if you have something to do with the building of Komorní Hrádek. It’d be interesting to see the castle in it’s gothic glory rather than it’s 16th century chateau remodel.