In some States the agreement of surrender must be coupled with a promise to give the
            child inheritance rights in the adopting parent's personal property where the child
            otherwise would have none.
         
         The promise of inheritance rights need not be stated separately and precisely. It
            is enough if the words in the promise to adopt show clearly the obligation to give
            the child inheritance rights. Where the language is ambiguous, consider the later
            words and actions of the adopting parents.