Aite, I'm out, feel suddenly like I've been made to waste my time 😐
His Sister literally made him miss the birth of his Children (Who again randomly appeared), while practicing to kill his Wife and in the end it ends in a big nothing burger, then author randomly decides to timeskip and have his children be grown up and just repeat what he started the manga with 😐
Guess thats one way to go about it, if you're out of ideas