So Kirk, what you're saying is that the alias, when it appears, goes with the title in this family's tradition. So if I am Jack Fiennes de Clinton,of Say and Say, and I have three children, my eldest, Simon, would be Simon Fiennes de Clinton, of Say and Say, and my daughter Josephine would be simply Josephine de Clinton, and my younger son George would simply be George de Clinton, all with a WikiTeree LNAB of Clinton.
If this is the case, then one effect of this understanding is that we would not showing an alias of Fienne for all the childeren and grandchildren who are not inheriting the title itself.