I could at least sort of tolerate it if it was their house not his, but yeah you moved into his house, as far as I know he doesn't really have to hear you out on anything. The guy sat there agreed to all your demands, and served you despite attitude, and yeah I'm sorry a taser like that wouldn't fly in any country. Like the daughter is acting like her mom has sawdust for brains, she is literally a lawyer, and would obviously scope out the dad and son to know what kind of people they are.
At least three of sister seem decent.
Like I do get it, this is the issue with Isekai and most works in general, you need to start at chapter one, even for a work that is 100s of volumes long, and the starting chapter can only differentiate itself so much, which is why most isekai pretty much feel the same through first couple of chapters, but clearly there are things you can add that will just alienate people, so nobody will care if it gets better on. I can honestly think of only one or maybe two works that started off poorly, turned people off, but were able to get people coming back later. You are much better off pulling a Hagani , rope everyone in, make your money, brag to your readers you made your money, and then nuke the story in the last volume giving everyone the middle finger, while counting your money and roasting some sweet potatoes from the steam coming of your nuked fan base.