1) High Lord Count Aral Vorkosigan, current spiritual successor of King Pelagia who ruled what is now Pelagia Province at the conclusion of the Twelve Kingdom Era, reigns over Great House Vorpelagia as direct representative of Emperor Gregor Vortapani. He swears his fealty to the Emperor (and only to him!). He acts in the best interest of Pelagia Province, its High Vor and Low Vor component Houses starting with House Vorpelagia (the version collecting taxes in Pelagon System directly), always as a component of the Imperium.
1a) Baroness Cordelia Kosigan (designated Heir to the High Lord, and theoretical future High Lady. Fealty sworn to Emperor Gregor Vortapani directly and seconded to High Lord Count Aral Vorkosigan.) Absolutely every political opponent who might ever consider assassinating or chemically disabling the High Lord of House Vorpelagia has taken one look at Countess Cordelia Vorkosigan and decided, Nope! I will continue to struggle with Admiral Vorkosigan, thank you all the same. I hear she chopped off a man's head when he annoyed her too much during the Long Night. Brought it back in a shopping bag.
3) Count Ipati Vorpelagia (spouse/partner of titular head of house, usually non-inheriting but possessing specific responsibilities and authorities in support of the head of House. Fealty sworn to Emperor Gregor Vortapani directly and seconded to High Lord Count Aral Vorkosigan.)
4) Lord Trad Vorpelagia (officially designated Heir of titular head, often serves as Count's Voice either in regional administration or in the Council of Counts while the titular head is occupied elsewhere. Fealty sworn to Emperor Gregor Vortapani directly through their Count and seconded to High Lord Count Aral Vorkosigan.)
6) senior Armsmen, especially those who have been Armsmen of this particular House for 20+ standard years, swearing fealty to a specific member of the House who in turn swears fealty in an unbroken chain up to Emperor Gregor Vortapani