I'm not sure the game's even capable of tracking that info currently, much less displaying it to player in way that would be unobtrusive, or interesting. Since the goblins and NPCs aren't usually named any sort of family tree wouldn't make much sense anyway.Having miscarriages instead of outright prohibiting incest would be not fun, in my opinion, because tracking who is whose mother in this game is too troublesome for the player.
GoblinLordWantsMe... generates a family tree iirc.
IMHO first step would be to start filling in the slave Bio (which exists, but empty unless player fills it with info) and assigning the unnamed NPCs and monsters randomly generated names, so that a log / family tree would even make sense. But dev isn't getting their ideas from here...
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