I know how shits about to go down. Abusive-mf will lose that fight, then blame Dan for it (the pics he got sent), hurt Dan and well,, same shit that happens always: he regrets it at some point, his backstory gets shown so Readers might have a lil sympathy left (hope he dies), chasing Dan and then they get together again
I rlly do believe that Rudiger loved Luca, but js couldn't understand it. Rudiger never received any kind of parental love, thus leading to him thinking a normal father-son relationship is when no feelings are involved.
Don't forget he grew up with a brother who got spoiled rotten and a father who obsessed over his wife. He probably thought that extreme display was the only way to express love. So in his mind he couldn't love Luca because he couldn't spoil him since he needed to be raised to be a viable heir to the family. Ironically, raising him to be self-sufficient is a much healthier form of love then spoiling (until you fuck it up by telling the kid you don't love them
I hope the author knows how to fight