In multiplayer on ps5; when the day comes to have the baby, the cut scene shows, then you need to accept which one. I cannot choose any of them with the x button. Only the O button works and it brings me to a black screen, but no matter how long you stay on that black screen nothing continues.
Another detail is we are married to each other in co-op so its player x player.
Also, the achievement for getting married never popped when marrying player x player.

