My father has another family. Can they claim the estate?
It depends on the document, not the bloodline. If your father dies without a will in Singapore, the Intestate Succession Act 1967 defines 'child' as a legitimate or legally adopted child — children born outside marriage cannot claim their father's intestate estate, and Singapore's Court of Appeal confirmed in 2009 (AAG v Estate of AAH [2009] SGCA 56) that they also cannot claim maintenance from it under the Inheritance (Family Provision) Act. But a will changes everything: he may leave his estate to anyone he names, from either family. And insurance and CPF nominations pass outside the estate entirely, whoever they name. So the real question is never 'can they claim' in the abstract — it is which documents exist, and whose names are in them.
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If there is no will: Singapore intestacy draws a hard line
Under the Intestate Succession Act, the statutory shares — half to the spouse, half among the children, in the standard case — flow only to the lawful spouse and to children the Act recognises: legitimate or legally adopted. A child of an unregistered union has no intestate claim on the father's estate. The one statutory exception runs through the mother: under section 10 of the Legitimacy Act 1934, a child born outside marriage can succeed to the mother's intestate estate if she leaves no surviving legitimate children.
The Court of Appeal closed the remaining door in AAG v Estate of AAH [2009] SGCA 56, holding that 'son' and 'daughter' in the Inheritance (Family Provision) Act 1966 do not include children born outside marriage — even where the father's name is on the birth certificate and he supported them in life. Whichever side of this line you stand on, the point is the same: intestacy is not a judgment about anyone's worth. It is a statute defaulting in the absence of instructions, and it is precisely the outcome a father with two families is least likely to have intended for either of them.
What a will and nominations change — for either family
A will overrides the intestacy line entirely. Singapore has no forced heirship for non-Muslim estates: a testator may leave everything to his second family, everything to his first, or any division between them, and the ISA never enters the picture. A valid will naming a child born outside marriage gives that child exactly what it says. Equally, a will can be challenged — capacity, undue influence, knowledge and approval — which is why late-life wills that reverse decades of arrangements are the most litigated documents in the region's case files.
Large assets also move outside the will altogether. CPF savings pass by CPF nomination, not by will, and a nominee can be anyone. Life insurance under a revocable nomination (section 49M, Insurance Act 1966) or a trust nomination (section 49L, for the policyowner's spouse and children) pays the named nominees directly; a section 49L trust nomination does not even form part of the estate. A family confident of its position under the will can still discover at the payout stage that the policies and CPF answered to different names. Mapping which assets pass by which instrument is the sober first step for a member of either household.
The regional contrast: the same question, three different answers
Indonesia is the cautionary tale. When Sinar Mas founder Eka Tjipta Widjaja died in 2019, a son born outside marriage, Freddy Widjaja, sued in 2020 claiming heirship to assets he valued at US$45.8 billion; the group's answer was that a child born out of wedlock held no stake. Indonesian law distinguishes recognised from unrecognised children, and a 2010 Constitutional Court ruling (No. 46/PUU-VIII/2010) opened civil claims for biological children who can prove paternity — which is why proof and recognition, not affection, decide these cases there.
Hong Kong abolished the distinction: since the Parent and Child Ordinance took effect in June 1993, a child born outside marriage inherits on intestacy equally with any other child. Taiwan sits between: under the Civil Code, a child born out of wedlock inherits from the father equally once acknowledged (or after successful compulsory acknowledgment proceedings), and Taiwan's compulsory portions then protect that child against disinheritance. The same funeral, in three jurisdictions, seats three different sets of heirs — which is why families with assets across the region cannot reason from any single country's rulebook.