Actually, thinking back, my sister tended to be more covert with her negative behaviors (yes, I know that never changed). Lying was a big no no in our home, lie and you were punished.

It could be that my mother did say something to my sister about being nicer. My sister did tend to be nice to me in front of them. Ofcourse that changed when they began mentally declining and she finally knew she had control and they were at a point where they could not do anything.

One of my sister's creepy texts ended with "I have been waiting for YEARS". Very, very creepy.