Thanks for support! No, I don't think they should spend time 1:1 with her. Neither their dad agrees with this. My main problem is that I have never confronted her about way she is. I have not told her that she is most probably ill, I've not said how it's affecting me. My sister recently told her that it's disturbing how many negative remarks and teachings she makes and she started crying. She's far from being aware that she has a problem. Not even speaking about MI that has to be treated. She cannot stand feeling that someone is angry with her and in any case of argument or me distancing she will force the conflict to resolution. Well, I feel I lack social skills to resist.