i think from what i can remember, Tia is still going to manage the lombardi household even after they got married. more or like Perez made it that way so Tia can still be a lombardi and be an empress. actually it's confusing for me as well but that's how far i can remember from the spoilers
Spoiler!!!
He makes the emperor change the law so that Tia can be both Head of Lombardi and Empress. Aaaaaaaand also Tia wanted to have enough children to inherit their titles. Iykyk. (▰˘◡˘▰)
Spoiler!!!!
And tia been teaching her cute cousin creni to take over the family once he finish his studies
Perez is going to be the emperor, while Tia is presumably going to be the head of Lombardi. How can they get married if they both have their respective positions?? I ship them but I don't see how they can make it work :((