Rubuta ci gaba ga wannan sakin layi - Masterson ya rasa mahaifiyarta a cikin hadari na Galveston na 1900
cewa ta tsira. Masterson yana da ɗan'uwa ɗaya da 'yar'uwa ɗaya, Wilmer D. Masterson da Lewis Fisher. Masterson kuma ta yi amfani da 'yan uwanta don haƙa ma'adinai a cikin ma'adinan tungsten a Nederland. Dukkanin 'yar'uwarta, Amanda Masterson, da kuma dan uwanta, Wilmer Dallam Masterson IV, sun halarci UT.