I whanau a James Byron Dean i te Hui-tanguru 8, 1931, i te whare Seven Gables i te kokonga o te 4th Street me McClure Street i Marion, Indiana, ko ia anake te tamaiti o Mildred Marie (Wilson) me Winton Dean. I mate ia i te nuinga o nga tau o Ingarangi, me te iti ake o nga Tiamana, Irish, Scottish, me nga tupuna Welsh. I kii ano ia ko tana papa he waahanga no Amerika taketake, a ko tona whaea no tetahi "raina o nga kainoho taketake ka taea te whakahoki mai ki te Mayflower". E ono tau i muri i te wehenga o tona papa ki te mahi ahuwhenua hei tohunga hangarau niho, ka neke a Dean me tona whanau ki Santa Monica, California. I whakauruhia ia ki te Publicwood Public i te takiwa o Los Angeles, California, engari i muri tata mai ka nekehia ki te Indiana McKinley Elementary School.
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