Only those listed in s1 of the Inheritance Act can bring a claim and they are;
Spouse or former spouse (or civil partner/ former civil partner)
A child of the deceased or any person treated by the deceased as his/ her child
A cohabitee who has been living with the deceased as though a spouse (or civil partner) for a period of at least 2 years prior to death
A person financially supported by the deceased immediately prior to their death.
Claims can only be bought under the Inheritance Act if the deceased died domiciled in England and Wales.