Yes, it's DNA result. I think Shinobu wanna break up because his wife blackmailed him, no other reason.
From the DNA result, they're SIBLING. The possibility is...
The legitimate wife's barren so she allowed her husband to have mistress but have to give her the heir, so Shinobu's taken in family.
Shinobu loved bro but hated the mistress(his real mom) thought that she hurt his mom(legitimate wife) caused him contradictory. Knowing they're sibling, clears all his contradictory, should make Shinobu loves his bro even more. I really wanna know how Takezou feel about this.
Shinobu's wife is really scary. (=_=:) That's why the lil son could set something up by splashing the hot water on his dad face or even threaten them later.
This manga's already so much worth read. So I don't mind about the ending.
I also trust the author, just leave it in her hand to thrill me more. Heh~ (^‿^)
The son splashing hot water on his dad's face is kinda boring. In my opinion that is not really a good plot. Threatening them about what? their relationship? I feel like they some what would not care anymore.
This is fun creating scenarios for the next scenes and stuff. I always like to know if my predictions are right when the chapters come out. There are times that I am right and there are times that I am completely wrong. I like it, it makes everything interesting.
SPOILER!!!!
Was that a DNA test that he was holding at the end? If it was, will it really matter what it says though? If the DNA test says that they are not brothers will they break up? seems kinda odd but possible since this kind of story is not really in a vanilla side. I want the DNA test to say that they are brothers to keep the story's theme. I personally want a dark ending for this story because it started as one and it should end that way.