Fifth Holy Grail

What you write is indeed a bit natural, especially the description of the relationship between people, without logic. The background does not explain clearly whether the protagonist is the only candidate and whether he can be replaced. It does not explain clearly, leaving the protagonist with too much power. A person's power does not come out of thin air. And when it comes to nobility, the first impression is reputation, and the honorary class is the most difficult to break through. Differences in status, differences in blood, differences in reputation, etc. The summary is that the protagonist is too presumptuous. I am the head of the family, so I can just change someone and kill the protagonist. Moreover, what you describe is not a very united, loves each other type of family. The most taboo thing about writing novels is to force the protagonist to live without logic (possessing mismatched powers). Forcibly pretending is a poisonous point, and the three golden chapters are the most discouraging.

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Heroic Spirits: "Come and see, there is a Holy Grail here too😍" "Hmph, then these miscellaneous cultivators can't get their hands on my king's things😤" "We have to be careful, because someone has a history of destroying the Holy Grail😰" "ex, curry stick😫"