Iruan's mother, however, fell sick and died. Wu put Iruan in the care of the boy's maternal grandmother, and signed an undertaking acknowledging the latter as guardian.
其後吳憶樺的母親不幸因病過世，吳憶樺轉交外婆撫養，吳登樹也曾簽字同意由外婆出任監護人。