Good, keep them to a minimum, please! I personally think animations aren't worth the effort anyway. You spend lots of time and render performance into something which can be done just as well or even better with three or four non-animated renders or even an extended scene.
I am not sure if people actually need more details about David. Right now I seriously think they thirst way more for naked facts regarding Anna. It's your game,
Mr_Palmer and as I already mentioned before I do trust your judgement. But I would delay fleshing out David's story in favour of some urgently needed action. Maybe even some action with David himself, eventually an unsuccessful attempt from David to fix the marriage. Something like that...