Rugadh Nicholson air 22 Giblean, 1937, ann an Neptune City, New Jersey, mac nighean-seinnse, June Frances Nicholson (ainm-seinnse June Nilson). Bha màthair Nicholson de shliochd Gàidhealach, Beurla, agus Gearmailteach. Phòs i an t-seinnsear Eadailteach-Ameireaganach Eadailteach Donald Furcillo (ainm-seinnse Donald Rose) ann an 1936, mus do thuig i gu robh e mar-thà pòsta. Thuirt an neach-eachdraidh beatha Patrick McGilligan ann an leabhar Jack's Life gur dòcha gur e Eddie King (a rugadh ann an Latvia, Edgar A. Kirschfeld), manaidsear June, athair bith-eòlasach Nicholson, seach Furcillo.
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