A more thorough explanation:

The worthier-title doctrine is a legal principle that applies to wills and property. It states that if a beneficiary of a will would receive the same interest as an heir under the laws of intestacy, the person takes the interest as an heir rather than as a beneficiary. This means that if the beneficiary is already entitled to the property, they cannot receive it again through the will.

For example, if a person's will states that their son will inherit their house, but the son is already entitled to the house as the only surviving heir, the worthier-title doctrine would apply. The son would inherit the house as an heir, not as a beneficiary of the will.

In property law, the worthier-title doctrine favors a grantor's intent by construing a grant as a reversion in the grantor instead of as a remainder in the grantor's heirs. This means that if a grantor gives property to someone but intends to keep some interest in it, the grant will be interpreted as a reversion to the grantor instead of a remainder to the grantor's heirs.

For example, if a person grants their property to their friend but intends to keep the right to use it for a certain period of time, the worthier-title doctrine would apply. The grant would be interpreted as a reversion to the grantor, who would retain the right to use the property for the specified period.