My sister and I are heirs to our father’s estate. My sister is under enhanced guardianship (curatelle renforcée). Do we need the judge’s authorisation to accept the inheritance outright?

No, subject to conditions. A person under guardianship may accept an inheritance alone, provided they have a certificate from the notary stating that the assets clearly exceed the liabilities (Article 467 of the French Civil Code, which refers to Article 507-1 of the Civil Code on guardianship). In the absence of such a certificate, the person under guardianship must be assisted by their guardian.