Gates akazvarwa muSeattle, Washington, musi wa28 Gumiguru 1955. Iye ndiye mwanakomana waWilliam H. Gates Sr. (akazvarwa muna 1925) naMary Maxwell Gates (1929<unk>1994). Madzitateguru ake anosanganisira Chirungu, ChiGerman, ChiIrish, uye ChiScotch-Irish. Baba vake vaive gweta rakakurumbira, uye amai vake vakashanda mubhodhi revatungamiriri veFirst Interstate BancSystem neUnited Way. Sekuru vaamai vaGates vaive J. W. Maxwell, purezidhendi webhangi renyika. Gates ane hanzvadzi imwe yakura, Kristi (Kristianne), uye hanzvadzi diki, Libby. Ndiye wechina wezita rake mumhuri yake, asi anozivikanwa saWilliam Gates III kana "Trey" nekuti baba vake vaive ne "II" ASX yakakwana. Mhuri yaGates yaigara munzvimbo yeSand Point muSeattle mune imba yakakuvadzwa nedutu rakashoma paakanga akwegura makore manomwe pakutanga kwehupenyu hwake.
hanzvadzi yangu Kristi (Kristianne), uye hanzvadzi yangu Libby