Dad isn't wrong.
Dad isn't right either.
Dad never lived as a commoner, and hence can't understand the worries of lower strata.
Son have lived as commoner in previous life
Son lived as noble in this life
I'd say son have more balanced insight.
jewel looks good, but it's worth is only determined by societal construct.
by itself, jewel have no practical use. without jeweler to cut it, it won't even look that great.
i'd say it's an apt nickname.
i know japan have ell bones cracker, at least.
in my case, everytime i eat fried fish, after i ate the flesh i will deep fry the bones(provided it's not really thick) and that will make it crispy and brittle.
looking as the cover art still have susanoo, i'd guess that by fusing, the old man is actually helping susanoo heal.
and susanoo will takeover somehow.