 After their mother's death, the twins were raised by Chang's brother and sister-in-law, Chang Hau-juo () and Chi Chen (), respectively, who were officially listed as their parents.They escaped to Taiwan with their uncle and aunt in 1949 and settled near Hsinchu.After a legal process that included obtaining written declarations from Chi's sons, documents attesting to the father-sons relationship between Chiang Ching-kuo and the twins from retired general Wang Sheng (), the birth certificate listing Chang Ya-juo as his mother and DNA testing to prove that Chi was not his birth mother, John Chiang was able to obtain a new ID card listing Chiang Ching-kuo and Chang Ya-juo as his biological parents in December 2002.