For applicants who are under age 20 and are the children or grandchildren of an R.O.C. (Taiwan) citizen with household registration, and the applicant’s parents must currently have household registration in the R.O.C. (Taiwan), one original Household Registration Certificate issued within 3 months that shows registration of the parents’ marriage is required. 2. For applicants who are under age 20 and are the children of an R.O.C. (Taiwan) citizen without household registration, a foreigner having obtained APRC or ARC or other kinds of residence permits, a Hong Kong or Macau resident, or a Mainland Chinese citizen, proof of parent’s marriage is required.