Lol, the hand grip tool in a historical manga. Already forgot what year they’re supposed to be in, but if it’s before the 1930s then it wouldn’t be in existence
That was a 💩 law to begin with. If your first born is an idiot (as Viese and the 1st prince) you’ll ruin your whole family. If they have no sons, then it’s son in laws, but most don’t like leaving people who aren’t blood relatives run things.