Nana B is the grandmother of Darius Davis.
Over time, Nana B developed respiratory issues which forced her to rely on heavy and expensive medical equipment. When Wilder and Davis were imprisoned in the Los Angeles Penitentiary and Wilder had an opportunity to get out, he promised Davis that he would look after Nana B.
Years later, when Davis assaulted the PRIDE Construction Site, Wilder threatened to hurt Nana B in retaliation. This greatly angered Davis, who kidnapped Wilder's son Alex and took him in front of Nana B's Residence, explaining him who Nana B was and how he felt that he had been betrayed by Wilder, including regarding Nana B's medical treatment.
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In chronological order: