Thoughts on guidelines for familial relations. Some of this is extrapolation and/or largely making things up, but hopefully it holds together. Units pop with the ability to recognize their relations on sight and there is a modest loyalty bonus between relatives.
-Unit type match is required. That is, for two units to be related they must both be archers, both warlords, etc. Rulers, heirs, casters, and warlords are considered one unit type for this purpose. Units which have changed type will retain old familial relations but all future relations will be of their new type.
-An heir is always popped as the ruler's child.
-Non-heir units can be popped as other units' children, but the parent unit must be inside the city where they are popped for the entire duration of their pop cycle, or be linked to that city in some fashion (ex., being popped as "Count of City A" may cause subsequent warlords popped in City A to be the Count's children).
-More important units (Rulers, then by level, reputation, and Fate) are more likely to pop children, if multiple potential parents are present.
-Units which share a "parent" are always siblings.
-Units popped in the same batch are always siblings.
-If they do not share a parent, units may still pop as relations if they are popped in the same city, even if that occurs on widely separated turns. The chance of this is inversely proportional to unit pop rate (so stabbers rarely randomly pop as siblings/children of existing units; special A/Bs and knights do so uncommonly; for warlords and special Ds it happens all the time).
Opinions? Am I missing anything here, or would these guidelines result in notable effects which might not be desirable?