they be half brothers, same father (the emperor) different mothers
there's the EX crown prince (the eldest
the new crown prince
and the crown prince's twin brother (they are identical twins so you have to pay extra close attention to the story to realize when it's the crown prince talking VS when it's his look a like twin lol
In this case, he means "blood brother" as "sibling from the same mother", because in a polygamous, "favorite-son-takes-all" society, each man's several wives and children were "family" in name only, being in fact arch-bitter-rivals at each other's throats for the man's inheritance. Moreover, their position at the man's house depended A LOT from each of their maternal families' leverage, in order to be able to compete, and even survive.
Are they blood related or no? Because he says to his mother that his twins his only blood brother so I’m a lil confused