Your sister is not a toy

I don't know why but just lately my eldest has started using her little sister as a plaything; telling her what to say, what to do amongst other things. I didn't realise how serious this could be until her little sister stopped talking except when told what to say. Her whole behaviour altered. We are working on attempting to repair the damage that has been done. I have no doubt that it was not malice that caused this to happen. The girls love each other and at 5 years old there is no way she could have known. All we have to do is try to reverse the effects. Hopefully we will get our chatty little girl back.