Household Registration Act Article 11

People who have no or are limited in capacity to make juridical acts when placed, selected, altered, considered, appointed, or delegated a legal guardian should conduct registration of legal guardianship.
中文原文 戶籍法第11條
對於無行為能力人或限制行為能力人,依法設置、選定、改定、酌定、指定或委託監護人者,應為監護登記。

English translation for reference only; the Chinese text prevails. Not legal advice.