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Timotheus is the one who holds the title of First Son.
Damianos may be the Blood Son, the only Blood Son, (as he often reminds them) but his illegitimacy actually leaves Tim, who may not be Brutus’ by blood but is the child of two respectably wed nobles, lesser though they may have been, and heir to another estate in his own right, as far more socially suitable. For now at least, though that is likely to change in the coming years.
Iason was First Son for the short time he was there, but being dead put a stop to that. Yeah, he’s back, but he still isn’t going to march into the Hall and lay claim to the Inheritance. And according to the gossipers he was barely tolerable as heir in the first place, considering that Brutus adopted him straight off the streets.
Kassandra is obviously out, being a daughter and therefore most emphatically not a son, and her mother’s blood, that gives her features the cast of anther people, doesn’t help.
As for Dika himself, he’s so far unsuitable he doesn’t know that it would be possible to be more so. He’s pretty sure that “slave-born gypsy performers” are not generally considered appropriate heirs to lords of great houses, let alone to the Prince of Gotham himself. Brutus only freed him recently in any case, well after he was man-grown. That would seem to preclude being any kind of Son at all.
Try telling that to the rest of The Family.
Timotheus is the First Son, but Dika is, and always has been, the Big Brother.