Holy crap, this connects back to the first chapter. I'm confused, I wonder why it seems like his shogi father is the one who left him in the first chapter, but here we see that it was his own choice in choosing to leave and be dependent. I'm so confused, the first chapter almost felt like he held some grudge against the shogi father.
And it's really sad to see that even that family was pretty broken. Obsession with something always tends to do that. The father's obsession with shogi led him to neglect his actual children and not see their emotional and mental health all too important. He seems like a man who cares, but his obsession with shogi made him into a man who became neglectful to those who didn't perform to his standards within shogi. That leads to a very complicated relationship with MC, as I'm sure MC looked up to him as a father figure but understands that he's stolen that from the man's own children. At the same time, if he didn't perform well in shogi, would this man have even shown any attention and care to him?