I've thought about conquering Dacia, and if they ever betray our long-lasting alliance they will fall very quickly. However, there are many other places on my list of what I want to conquer first. The Aedui will more likely force me to intervene in the Gallia situation and cause border problems soon, too.

When I conquered Roma, one of their family members was outside the city and became rebel. I then bribed him to join me and since he was 16 or 17 at the time he is still alive to lead his armies. Since you cannot have different bodyguards for Family Members, he looks like my generals and has a Hetairoi bodyguard.