alcohol paranoria

My sister goes over to our 90 year old mother's assisted living apt and drinks wine and then starts crying that none of her sisters love her and no one will call her.  This behavior saddens my mother for days.  My sister is doing other bizzare things that is out of her norm.

[Roger Gould, M.D.]

I am not sure about the question here.  Why don't you talk directly to your sister and ask what is going on, and correct any misconceptions she has, as well as remind her of the effect on your mother....