calimesa, california, riverside county. historic missions.prawling suburbing creeping out to the rim of mountains around the eastern flank of los angeles. here is where chris and cristi hall had come to live out their golden years, though they were far from old when it happened. just experienced, with life and each other. >> as far back as i can remember, it's always been chris and cristi. they were never thought of as separate. they were a unit. >> these are the three daughters. courtney, the eldest, is a teacher. brianna, a personal trainer. and ashton, the youngest, just returned from playing professional volleyball in europe. all of them of course have heard scores of times the story of how their parents met. it was 1978. cristi had gone to see a relative at the air force base in nearby san bernardino. quite by chance, while she was there she encountered a security guard who, to her at least, looked just like elvis. it was blair christopher hall. chris to his friends. >> apparently she was a little flirty at the gate. [ laughter ] >> in s