sandra announced she had now helped as much as she could. she was done. >> i was referred to her attorney and she refused to meet with us again. >> reporter: same thing happened with sandra's kids, jack's stepchildren. while jack's blood relations practically begged to help solve the case. so what happened to that big happy family in the video? a mirage, perhaps? in fact, living with sandra, said jack's daughter cheree and cheryl, was a fairy tale, the kind britain by the brothers grimm. >> she was mean to me. she wanted me completely gone. she did everything she could to try and get rid of me. >> reporter: when it came to her own children, they said, sandra was indulgent, eerily so with son tom. >> he was a really good mama's boy, to the point it was strange, very weird. >> very weird. >> weird thing to watch. >> they're always walking into the other room and closing the door. >> yeah. >> reporter: though jack seemed quite happy with sandra. until the spring of '98, that is. just a few months before the murder when jack was diagnosed