Elizabeth Hurley's son, Damian, was born out of wedlock and his American millionaire grandfather sought to exclude him from the trust he set up for his "grandchildren".  

Damion was born following an affair between Elizabeth Hurley and businessman, Steve Bing.  Steve's father, Dr Bing, created the trust in 1980 but was unwilling to consider those of his son's children who were born out of wedlock and whom he had never met as his  "grandchildren" and therefore beneficiaries of the trust.  Dr Bing sought clarification from the court in Los Angeles. 

The Court ruled that the meaning of "grandchildren" in the trust document could not be interpreted as Dr Bing sought to do.   Instead it confirmed that any grandchild would benefit in accordance with the usual meaning of the word. 

Family trusts are prone to these kind of interpretation disputes.  A trustee may be deliberately trying to exclude certain beneficiaries by adopting a particular interpretation or it may be that the trust document is unclear.  Trustees are not always right, even professional trustees.  If a different interpretation of the trust document will have a substantial financial impact, the trustee or a beneficiary can seek a declaration from the court to determine the matter.

I acted for a client in connection to a family trust after the trustee decided that she was the result of an extra marital affair and therefore should be excluded from the division of the trust fund.  After proceedings were started in the Chancery courts for a declaration on the matter, the trustee reversed his position and the trust was divided equally.  

The English courts follow certain rules of interpretation which, in summary, mean that judges generally try to give words their usual common sense meaning and consider the intention of the person who created the trust and the circumstances at that time.