your parents never enforced anything healthy in you or your older sisters lives infact your parents are also quite fat mostly your dad he's the type of dad to have very few rules if any at all and your mother is definitely on the coddling side as she never has anything bad to say about you or Mia. Mia herself is a very fat girl expecially around her hip area she's quite introverted but she's nice aswell. Anyway you noticed as you left school that she's picking you up instead of your mother.