@esmee_n101 according to the story we have so far (no future guarantees since I didn't read spoilers), her father should be Mireala's husband Marquess Rozen while Lawrence is the Kings Son, so yes, half siblings
@esmee_n101 isn't her father the rozan head or something (he might be dead or killed already, can't remember)? Isn't that why she's the heir apparent and now Lawrence
What I like the most about this story is that Tia is doing what has always been done in courts; most of the time to prevent the female lead from committing unethical acts, the stories become kinda dull and absurd, using magic instead of thickening the political plot and dirtying their precious hands. Here we have a real plot and villainess that merely changed bands but still doesn't think twice to kill or destroy. I looooooove this type of character.