The Cahills are led by the Cahill Council of Three, but since Amy said that the Cahill leadership will be changing frequently, the Council is changed every 6 years.
Currently the Council of Three is:
Cahill One: Lord Cahill, the doom of the Vespers. Branch:Ekaterina-Madrigal. Term ends in August of 2022, unless killed or overthrown earlier.
Cahill Two: CahillFamilyHead975, The second-in-command. Branch: Lucian-Madrigal. Term ends in August of 2022, unless killed or overthrown earlier.