Mental Capacity Act (Cap. 177A): Primary legislation governing the appointment of deputies and guardians for persons lacking mental capacity. Defines scope of guardianship powers and outlines duties and responsibilities of guardians.

Guardianship of Infants Act (Cap. 122): Legislation regulating matters relating to guardianship of minors (below 21 years). Defines rights and authority of guardians and sets out the court's powers regarding guardianship.

Family Justice Act (No. 27 of 2014): Establishes jurisdiction for family-related matters including guardianship and outlines court procedures for guardianship applications.

Immigration Act (Cap. 133): Relevant legislation for international travel permissions and requirements for minors traveling with guardians.

Personal Data Protection Act 2012: Legislation governing the handling of personal information of the ward and privacy requirements in documentation.

Common Law Principles: Established legal principles and precedents regarding guardianship from Singapore's common law system.

Family Justice Courts Practice Directions: Procedural guidelines and requirements set by the Family Justice Courts for handling guardianship matters.

Institutional Requirements: Specific requirements set by institutions such as schools, hospitals, and other organizations that need to recognize the guardianship authorization.