Kyran appeared before the Patriarch and the remaining elders of the Lumley Family only. This was because, according to the memory Raya extracted from the Boyd members, there were still a few Boyd members hiding among the regular Lumley members.
Similar to what Kyran had done to the Courtenay Family, he only made the Lumley Patriarch and the remaining elders swear allegiance. As for the rest of the family members, their patriarch and elders' fate was connected with them.
The arrangement was similar to the Montgomeray Family. However, the effect was the opposite. Because in the Montgomeray Family, if Ezra betrayed Kyran, all of the Montgomeray Family would suffer with him. As for the Lumley Family, if any of their members betrayed the Regis Clan, they would die along with their patriarch and elders.