In rome 2 I dont even know/or care about who is my family head. Losing the family tree in my opinion has dealt a pretty big blow to my immersion with the characters. By the end of a long campaign you could just scroll down the huge family tree and remember which family member conquered what and which died in that fight to the death retaining a new city. Not to mention how the children of great generals retained some of their parents traits at times. Lets be honest how awesome was it in rome 1 to see your family line evolve and play favorites towards the ancestors of your greatest generals as they died (especially be being able to make them the heir of the empire).
Aside from all the bugs (AI just standing outside my walls while i javelin them to death while they literally run in circles), the feature that is not in the game which i miss the most is the friken FAMILY TREE!