The language of English law is ever-evolving, reflecting changes in society, technology and values. Legal words and phrases that once carried clear and unambiguous meanings can, over time, lose their clarity as our use of language shifts. This is very evident in the world of Trusts, where historic documents that were drafted many years ago face the challenge of being applied to contemporary family structures that their creators are unlikely to have imagined. The Trustees and Courts now navigate how such Trust documents should be interpreted. This evolution brings into sharp focus both the adaptability and the limitations of the traditional rules of trust interpretation.
The changing interpretation of trust language
Traditionally, the Courts interpreted trusts using a literal approach, giving effect to the ordinary contemporary meanings of words such as “child”, “issue” or “spouse.” In the nineteenth and early twentieth centuries, these terms were often closely bound up with assumptions about legitimacy, marriage and inheritance that today may appear outdated. Over time, case law and statutory reform have challenged or adjusted these assumptions, but many historic trusts continue to use definitions and concepts on those past understandings.
In recent decades, the Courts have increasingly acknowledged the need for purposive or contextual interpretation, particularly when the traditional approach would produce results at odds with equity or the realities of modern families. Surrogacy, assisted reproduction, blended families and non-traditional relationships all create situations for which old trust documents were not designed. The result is a tension between fidelity to the settlor’s original intent and justice for contemporary beneficiaries.
Issues arising from historic trust interpretation
When interpreting old trusts, several key issues frequently arise:
- Legitimacy requirements: Many historic trusts specify that beneficiaries must be “legitimate issue”, potentially excluding children born outside wedlock or by surrogacy, unless modern law or interpretive approaches intervene;
- Changing family structures: Family compositions are more diverse. Children may be adopted, conceived with donor gametes or born via surrogacy, raising questions about their status under terms grounded in older norms;
- Tax and jurisdictional concerns: International families and evolving tax rules create administrative uncertainties, especially when trust documents do not anticipate cross-border issues; and
- Intent vs. equity: Should the court follow the letter of the document or strive for fair outcomes consistent with what a “fair-minded” settlor would intend today?
Example: Cator and others v Thynn, Marquess of Bath and another
A recent example illuminating these challenges can be seen in the case of Cator and others v Thynn, Marquess of Bath and another[1]. In this case, the Marquess of Bath’s family Trust was settled under documentation that expressly referenced the pre-1970 legal meanings of terms like “issue” and “child,” which faced a modern dilemma as to whether the Marquess’ second son, Henry, born to a surrogate mother could be recognised as a beneficiary.
Trustees sought the Court’s blessing to exercise a power of advancement in favour of the Marquess, in order to give him the power to add Henry as a beneficiary. The question hinged on whether such an advancement was truly for the “benefit” of the life tenant, a term the Court found to be broad enough to encompass both moral and material advantages, such as peace of mind, family harmony and fulfilling a sense of fairness between siblings. The court ultimately approved the Trustees’ proposal, highlighting an adaptable and equitable approach to interpreting historic trusts in present-day circumstances.
Key takeaways
- Flexibility is essential: Courts will look beyond rigid, literal interpretations where historic trust language clashes with modern realities.
- Trustees should act proactively: When faced with uncertainty, trustees can and should seek court guidance on questions of interpretation and proposed actions.
- Moral and emotional benefits matter: The “benefit” to a beneficiary under trust law can extend beyond financial advantage to include peace of mind and a sense of fairness.
- Updating trust provisions: Where possible, settlors and their advisors should consider using modern, inclusive definitions in new trusts to avoid ambiguity for future generations.
- The law evolves with society: As family structures and social values change, so too must the approach to interpreting documents meant to safeguard family wealth and welfare.
[1] [2026] EWHC 1045 (Ch)
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Stuart Parris is a Senior Associate in our expert Dispute Resolution team.
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Contact usIf this article relates to a specific case/cases, please note that the facts of this case/cases are correct at the time of writing.