What makes you think Lilly is an ISTJ? The Sensing part could be true, but Introverted? there are not a single introverted bone in Lilly, I think.
And Mia ENFJ? INFJ is very probable, but she's not an Extrovert. It's not that she's shy, not just that; she needs a lot of time to be alone to ordenate her thoughts and seems as thoughtful and calm as many INFx. I don't know. To me she's introverted.
By the way, nice avatar, nice signature.
Mia: ENFJ or introverted.
Lilly: ISTJ
Michael: INTP
Grandmere: ENTJ
Helen Thermopolis: ISFP