▁Rus so ▁sib lings ▁are ▁w iz ards ▁in ▁training ▁and ▁live ▁with ▁their ▁Italian - American ▁father ▁Jerry ▁( David ▁De Lu ise ), ▁a ▁former ▁w izard , ▁and ▁their ▁Mexican - American ▁mother , ▁Ther esa ▁( M aria ▁Can als ▁Bar rera ) ▁who ▁is ▁a ▁mort al . ▁Alex ' s ▁best ▁friend ▁Har per ▁( J enn ifer ▁Stone ) ▁also ▁found ▁out ▁about ▁the ▁Russ os ' ▁w izard ▁powers ▁in ▁season ▁ 2 . ▁The ▁sib lings ▁have ▁to ▁keep ▁their ▁secret ▁safe ▁while ▁living ▁in ▁the ▁mort al ▁world . ▁When ▁they ▁become ▁adult s , ▁the ▁three ▁sib lings ▁will ▁have ▁a ▁w izard ▁competition ▁to ▁decide ▁who ▁will ▁become ▁the ▁family ▁w izard ▁of ▁their ▁generation ▁and ▁keep ▁his ▁or ▁her ▁w izard ▁powers . ▁Har per ▁used ▁to ▁have ▁a ▁cr ush ▁on ▁Justin , ▁but ▁now ▁is ▁in ▁love ▁with ▁Justin ' s ▁best ▁friend , ▁Ze ke , ▁who ▁finds ▁out ▁about ▁the ▁Rus so ' s ▁w izard ▁powers ▁in ▁season ▁ 4 . ▁Alex ▁Rus so ▁( S el ena ▁G ome z ) ▁and ▁Justin ▁Rus so ▁( David ▁Hen rie ) ▁are ▁the ▁only ▁characters ▁to ▁appear ▁in ▁every ▁episode ▁of ▁the ▁series . ▁ ▁Main ▁characters ▁ ▁Alex ▁Rus so ▁ ▁Alex andra ▁Mar gar ita ▁Rus so ▁( S el ena ▁G ome z ) ▁is ▁the ▁only ▁female ▁out ▁of ▁the ▁three ▁Rus so ▁sib lings , ▁and ▁the ▁middle ▁child .