In Kong Kin Lay & Ors v Kong Kin Siong & Ors [2025] 5 MLJ 891, the Court of Appeal set aside a will executed by a 97-year-old testator, holding that there was real doubt as to testamentary capacity, compounded by serious suspicious circumstances and undue influence by certain beneficiaries. The Court emphasised that while the “golden rule” is not a rule of law, failure to obtain medical confirmation of capacity where doubt exists is a grave omission. Credibility issues with the drafting solicitor, beneficiary involvement in the will’s preparation, and suppression of evidence led the Court to declare the will invalid and order intestacy.