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When you use dele or dela for the 3rd person singular, you don't change it to plural.
- His books = os livros dele, seus livros;
- Their books = os livros deles, seus livros.
On the first example, you know if it's related to he or they, but it is not the case when you use "os seus livros", which is the same for both of them.
In order to differenciate one from the other, most of time we use dele/dela. So, inspite of possessive adjectives have plural forms, it does not happen when using dele or dela for 3rd person singular.