The story didn't specify that he doesn't want his children to take the throne because why would he allow Lawrence to live? Anyway, the point is he killed his children with the empress and as I can see he had some more profound hatred for the empress. I just hope at the end of this all they will hang that emperor for doing that and killing Cedric parents too!
You are remembering correctly. It was one of the first chapters when the nobles are all talking amongst themselves, and say, "He allowed a child to live?!" So apparently the nobles know that he killed the children as well, and they are curious as to why Lawrence is still allowed to live.
What has me confused though, is that apparently there IS a daughter still alive? And she has three children. So shouldn't THEY be the ones who are in line for the throne, and not the Duke and the illegitimate son? I think somewhere it might have been that that the three kiddos were girls, but even then, shouldn't there be some sort of precedence for such a situation? It has happened in plenty of other empires through out history, and often times lead to a kick ass empress. Queen Elizabeth is one who comes to mind right off the bat. Empress Wu Zetian is another.
Did the author just conveniently forget about the daughter?
Lawrence is her (the FL) older brother by the way, for those who are confused. Remember, he turns to his mother and says, "Yes that is the second mistake you have made, in ruining my life. The first was allowing her to be born." With that line, and the fact that you see her as a youngster staring our from behind her mothers skirts at him, you can establish that he is older then her. How much older is the real question. I would venture at least seven to ten years though, considering how much older he looked then her, when she was a child. He looked about sixteen.
What did the empress mean when she said I will be watching. Overall the chapter felt like she had good feelings standing as her mother. But that line got me.