@HDMI1
Deid (Lutz' father) isn't the Master of that shop. I don't think they even do precisely the same job - that's a carpentry workshop, Deid's in construction.
Sieg's problem was reflexive more than anything. He couldn't distinguish between Lutz, Benno's apprentice and Lutz, his little brother whom he can bully whenever he wants. So he couldn't appreciate who is "us" and who is "them". To him, the employees of his workshop is an "us", Lutz is an "us", Benno is a "them". But in fact, at work, Lutz is a "them", too.