I watch my sister play minecraft a lot and she is getting married so she gave me her account and yea hope this is alright. and i changed the pass so she won't be able to get on this account if she wanted to. so i just wanted to say this so i dont get banned.
We really can’t enforce who controlling the avatar, and since you’re using the same account as her you’re not getting an advantage, so it’s no problem. (Someone correct me if I’m wrong.)
Khrones, having two account's is a very toxic situation and I suggest that you don't use it. There is no reason why one person should be controlling more than one account on ECC. I'm sure that you're aware that benefiting from using more than one account is illegal here. To avoid any future issues I strongly advise that you never use your sisters account on ECC.