The common definition of a "niece" is the daughter of your sibling.
This is just more of much ado about nothing. If he's found guity, he pays yet another fine (maybe it's how the Dems plan to plug the deficit). Ever notice that these complaints always seems to pop up just before an election? It's yet an attempt to distract from the always unethical happenings at the General Assembly.
It doesn't change the fact that the governor is still the most ethical and honest politician in the state (even if he's still not quite a politician yet).