You guys have put forth some great ideas onto what to do with the Roman family system in RTW. Though, in mentioning this I may to late to have any influence what so ever, but anyhow... I read in another posting, relating to a different mod, where the person eliminated the ability for a captain to move and having it only be possible for a famliy member to do so. Well taking that a step further, remove all movement points from family members, unless they are elected to an office, say praetor or consul; in which case they would receive movement points. (I think this could be done by editting the traits) Further, the ex-praetor etc, should also have movement points as the use of proconsuls etc was common in commanding Roman armies. Now I realize that this is completely out of left field, but in doing this a family system could be made to work (somewhat) with historical accuracy. Though, this really only work for the Roman factions...Also I have no idea to what extend this would mess with the ai.
Oh, and if possible the reforms of Marius could eliminate the past restriction of movement as the armies past this point can be seen as private to an extent. Finally, to make up for the overall lack of movement the movement points should be greatly increased over the average movement points.
This is only my humble suggestion and I realize it probably won't go over well, but I figured I might as well through it out. And by the way you guys are doing amazing work here.