@yannickq
Just a guess, those antiques probably belonged to his grandfather's family, and somehow got taken/solf off.
And he wants to honor his grandfather by getting back those antiques to their rightful place.
If he thinks they're just going to sign it so easily, think again. They are just their future home that fits all their needs, there will be no cutting corners.
Let me guess, he's going to use his son as a sacrifice again, cuz he wasn't sacrificed properly last time.. and the emperor will do anything just to stay alive, a coward that is scared to die.