Devastated to learn Gwen allegedly had a son Jonathan Winthrop with Ethan, Theresa once again decided to tell the truth of her son's paternity only to be threatened by Gwen and Alistair into backing down. Ever relentless, Theresa planned on telling Ethan until her own mother begged her not to, eventually admitting that Gwen and Rebecca were blackmailing her because of her involvement in the massacre of the Vasquez family in Mexico twenty five years before. An embittered Juanita Vasquez blamed Pilar, and threatened to exterminate the entire Lopez family, just as Juanita's had been. Theresa could not tell Ethan the truth even when Jonathan in need of a liver donor needed the help of a sibling. When Jane failed to be used, Theresa arranged for her son Little Ethan to be used in the procedure, unfortunately she had to keep telling Ethan lies, infuriating him. Gwen took advantage of the situation by telling Ethan that Theresa had another lover.