It’s not doing much of anything for now, I’ll add more to it later. When a Sim figures out who fathered their child, be it by elimination or by testing with the right one, they’ll get a certificate in their inventory.If the one tested with is not the real dad, he’ll be marked as not the dad, but since there’s still 2+ possibilities, the Sim still doesn’t know who is the real dad. If there are 3+ possible dads and the one tested with / about is the real dad, all others will be marked as not the dad.
Everything else in the system is added code by me.