Claire can't get pregnant by Paul because he is infertile or they have safe sex ? The game dosen't explane this. If they have safe sex it would be nice to have an option in the dialogue to have unprotected sex.
then I was thinking about a new game mode where you have to take care of Claire's son: the player can choose who the father of the child is which also determines the difficulty level of the mode, whether Claire is divorced or married. In this mode the player must take care of Claire's son by managing various financial difficulties and some unexpected events, a bit like in the original mode. The player lost the game if social services are alerted by the neighbors in one of the game's scripted moments or if we have not fully satisfied the child's needs.
Personally, it seems like an interesting mode to me, but perhaps it could make the game heavier and wouldn't fully fit in with the main plot.