Thx! I found out that it's Ruby giving birth to Cassie. BTW, who gives birth to Izzy?
If you click on the bottom line (about pregnancy) in the statistics window of a character marked with the “P” icon, a hint will appear and the opportunity to change the timing. If you don't want to change anything, just don't enter any numbers and press Enter.
Regarding the question of “who has who”, the game uses “pseudo-random” selection (according to the principle “who gets up first, gets the slippers”, except for Wanda and Moose, whose mother is Yvette). It worked out for me, for example Cassie - Jean, that’s why I wrote it like that. I don’t know who will have Izzy either, experiment
P.S. Oh yes, not all characters with "P" can have children, only human...