Yohane's dad got killed off-screen, oh that sucks for you buddy, but learn from Men and Lyserg, getting your parents killed is not a big deal, in fact it is a great way to make friends and get a power up, because oddly enough that's always the outcome
This is my most disliked Takei trope, he keeps reusing it again and again, and it is a waste of everyone's time, it has no payoff, the message is always the same, to just forget about it and move on, he just uses it as a cheap plot device to force a character to act out in conflict against their own team, then have the character punished for acting harshly, forgive the killer, befriend them, and go back to their team after apologizing for acting out, and now he is quadrupling down on it so hard with this crap, you have Men, Yohane and his sister, the twins who already went through this on the original series, and the dong family, oh hell i think there's also Sati's disciple, and that china girl... probably even more
And if we could get something out of it then great, but it is all pointless because we know already with how he resolved the previous cases, that all these developments amount to is the characters just taking the L, and even doing circus loops and becoming friends with the ones that killed their parents
In fact it is so pointless the one getting killed could have been Yoh, and not much would have changed with this, instead of Yohane acting out at a critical moment, being forced to apologise, then huggging and making friends with Daremoine, it would have been Hanna