Hi gmini
Firstly thank you for your most sincere apology.
Usually we take sibling excuses with a very large pinch of salt, but in your case as i have seen you on CraftyMynes for much of the time i've been on it and cannot recall you ever misbehaving in chat i believe you that it was your sister.
However you are responsible for your account so the ban still stands and is set to 24 hours from now.
I highly recommend that you change your passwords and dont share your account in future.