Yes anna is the mother of both of duke's bio kids. She was suppose to plant a spy for the organisation in the family throught her son, that was the very reason she married the duke. But in the process she genuinely fell in love with the duke and couldn't let the organisation take advantage of her son or her husband so she ran away when she was pregnant with rania. She lived quietly and raised rania until rania was 16-17 but the organisation found them and killed both of them then one of the members of the organisation possessed rania's body. And as for how camilla and ravi's mom died, i think it was due to health issues/illness. I dont think there is anything more to the reason of her death.
Thank you sooo much for explaining. I thought so, but the dialogue and text in the scene with the Duke's son as a child confused me
Was the mother of Lania who ran away also the mum of the Duke's first born son? Elite knight dude? ...Who's name I cannot remember right now
Also, did we ever find out how the FL's mother died?