Hereditary succession describes the passing of a deceased person’s property, rights and obligations to their heirs by virtue of family relationship, rather than by will or contract. In UK and Irish practice it broadly corresponds to succession on intestacy and to fixed rights given to certain relatives even where there is a will (such as legal rights in Scotland and succession rights of spouses and civil partners in Ireland).The term is descriptive rather than a defined statutory label, but it is used in textbooks, case law and some legislation as a convenient way to refer to succession based on bloodline or marital/civil partnership connection.In England & Wales and Northern Ireland, hereditary succession largely operates through intestacy rules and family provision legislation. In Scotland, it aligns with “legal rights” and intestate “prior rights” and “legal rights” under the Succession (Scotland) Act 1964 and later reforms. In Ireland, it links to the intestacy regime and the surviving spouse’s/civil partner’s and children’s fixed shares under the Succession Act 1965.Practically, the concept is relevant when advising on estate planning, construing wills, contesting estates and determining who inherits where no valid will exists.