Migration Act 1958 (Cth)

The parent statute. The Migration Regulations 1994 and the Schedules live under it. Three sections matter most for the case: s 65 (the decision), s 140A (the sponsor), s 234 (the criminal-disclosure offence).

The three sections that drive the case

s 65 - decision to grant or refuse

The Minister grants if and only if all criteria are satisfied. Binary.

s 140A - sponsor obligations

What Natalie commits to. Sponsorship limits + 5-year separation between sponsorships.

s 234 - false / misleading info offence

Criminal exposure (up to 10 years imprisonment) for knowingly false visa information.

Sections referenced in passing

s 46 - valid application. The application must satisfy the formal validity requirements (correct form, fees, lodgement channel) before it is even assessed against substantive criteria. Lodgement mechanics matter here.
s 5CB - "de facto partner" definition. The Act-level definition feeds reg 1.09A.
s 501 - character test. Independent of PIC 4001; Ministerial discretion to refuse on character grounds. Triggered by substantial criminal record or other character concerns. Not engaged by Eduardo's case.