By the way, the +/- gravitas retainers still have their effect while statesmen are in the capital.
Question: has anyone found a way to add (or delete) a household member to a character currently acting as statesman in capital? I'm 99.99% sure that the answer is "no", and that household members can only be added/removed when the character is in "general/admiral" status, but thought I'd check.

Also, seconding to confirm that it's perfectly possible to move +/- gravitas household members from character to character; just have to wait another turn as Slaists mentions.

My usual failing in this realm is that I forget about the Evil Mother-in-Law, and whatever opposition general to whom I attached her dies off, then I lose her. I even put "EM" in the army/fleet name where that general is, and I still forget...