For what I saw in this update David not even can control Alla, and he wants to have Tasha too. Besides i think in this version 0.3.1 everybody can see that who wears pants in the house is clearly Alla.
I haven't been in a position to post this all day, but Alex has posted on patreon a poll asking who wants to keep playing the father or take playing the father out of the game. So far keeping father in the game as winning but the score is only 8 to 7. Hopefully the remaining votes will sway in favor of son only gameplay.
In the first place this game started with we controlling the main character Alex, but as we can see he changed that in the last update (I know he already had done the same in the old model) and some people liked that, but for me this doesn't make any sense because people who liked this game and started playing it because they liked the way it was, why change that.
Now he shouldn't force people to choose between David or Alex. The best solution the creator of the game have here is making the game with the two playable characters available (David and Alex), and he had this chance when he started the new model a few months ago. Of course he would have more work to do but im sure everybody would be very appreciated if he do that.