@jonsmth I can accept that it might be normal. Doesn't make it any less shitty though.
Regarding the honeymoon, I was referring to some manga who has the parents leave for like a year on 'honeymoon'. Irresponsible. A normal honeymoon of a few weeks, of course you can't take the kids.😊
Also, it isn't a honeymoon in this case. It was a job transfer, and the mother decided to tag along. Makes sense to take the opportunity for honeymooning too, but there's no evidence that it's temporary. Them coming home could just be for the holidays. Doesn't seem likely that the manga would continue like this with parents present, and I doubt the author stretched the remaining week into half the series.😉
Letting kids take care of the household, shopping, cleaning, cooking etc., for an extended period with only infrequent visits by a guardian is a recipe for disaster. In my experience a lot of teenagers are total slobs, maybe it's different with the Japanese duty-mindset. These kids are responsible, but there was no knowing how they would get along.
Also, since it seems their guardian doesn't visit every day, what if an accident happens, or a criminal comes along. The kids could be missing or dead for days, if it happens on a weekend so the school doesn't notice, before someone finds out.
Maybe this is just my paranoid mind, but I just don't like the idea of ditching your kids for your new spouse. Seems like if you remarry with kids, you should accept that the lovey-dovey newlywed lifestyle isn't realistic, since the kids come as a package with their respective parent.