would be my question for you. >> reporter: speaking exclusively to cnn's piers morgan, the sister of james dimaggio, and the investigators say he tortured and murdered her mother christina and 8-year-old brother ethan before setting fire to his own house. >> i would like to remind you at this point my brother is still a suspect. he is not a killer. he is accused. and again, it is alleged. >> reporter: lora dimaggio holds out the possibility her 40-year-old brother is a victim, casting blame on 16-year-old hannah anderson. >> the hannah anderson that i saw a few nights ago on the tv is certainly not the girl that stayed in my home three weeks prior to them disappearing. >> what do you mean? what do you mean? >> i remember very vividly