I always thought that there was a lot more about Katherine than what we saw. Maybe Rebecca hated wire hangers and beat her with them whenever she got bored! Maybe it was little sweet Katherine who put poison into her daddy´s drink to force his death and inherit his money (but those Barnes bastards ended up owning their own shares!)...or maybe Rebecca loved "gallivanting" around Houston (once an adulterous, always an adulterous!). Anyway, both of them seemed to go from one extreme to the other, and that behavior has a name...If Rebeccabeech had gone cuckoo instead of Jessica and tried to kill Miss Ellie by drowning her in the pool...!! "It´s so hot, isn´t it Ellie? Come home and have a swim in my pool!" "Remember Pammy: kill the woman in the sack dress! She´s horrible. Promise me..."