guess we got solid confirmation her brother seen his mum having a second child as getting in the way of his legitimacy, tho at the same time it's unlikely she'd have been able to hold onto the title and properties without having a child with the dude even if it was only to elevate her standing so her son could be Prince.
Also with a potential redemption arc for Lawrence, I don't think that's possible. 
We've already seen him ignore his sister, his mother, ignore serious abuse, knowingly treat his baby sister as a tool and  like a minion, at every opportunity he's only cared when things would go well for him. Plus what he did in the first life, he'd have to do a hell of a lot of soul searching and good things to ever come anywhere near redeeming himself.