Yes, my sister has always lied, cheated, stolen, broken my possessions, given or thrown away my possessions, invaded my privacy, kept me awake at night, burst into the bathroom when i was on the toilet or in the bath, continuously stole my house keys from me and then wouldn't let me in when I was stood outside knocking on the door, belittled me infront of family, ridiculed and made my own friends laugh at me, told me on multiple occasions she wished I had died when I was poorly as a baby, called me fat and ugly when I had an eating disorder, all whilst treating our DB lovingly and adoring him.
She's just the same as an adult, only more calculating and manipulative. She uses people to get what she wants and if they are of no use to her she either ditches them completely or turns volatile. I am screamed at verbally abused if I try to stand up for myself so I mostly try to grey rock myself but she just seems to have had this obsessive campaign against me since I was born so she won't ever just let me go or leave me alone.
My parents know what she is like because she is generally a nasty piece of work to many but my mum takes the easy way out instead of telling her how awful she's being and takes the stance that she's caught in the middle of her daughter's silly feuds. My dad has always expected me to be the bigger person and try to see above it despite the psychological damage her behaviour has caused me.
I'm now in therapy and on anti depressants. My therapist thinks it's very like my sister has a personality disorder.