"Minos, why don't you join the Spiritual Church? We may not be able to make you the leader of the Black Plain, but one of your wives and little Sarah will be able to inherit that state..." Joseph said as he demonstrated he was willing to negotiate the terms of Emperor Stuart's entry into that organization.
Normally, the Church requires that all family members of its members be disassociated from other organizations to avoid conflicts of interest. So in normal situations, members of this great institution could not have family members active in other powers.
But this rule could have its exceptions when some parameters were met.
When someone was talented and worth the 'effort', Church headquarters closed its eyes to certain information not so good in its opinion.
So a new member could have his family still in their old organizations before joining the Church, as long as, from then on, all his new family members did not join powers other than the Church.
