My uncle is a very cheerful person.
His mother is a pretty woman.
Her son is an unattractive boy.
My aunt is a wonderful and interesting person.
His daughter is a very nice girl.
По идее так, но после артикля также может стоять существительное (профессия)
.... a veterinarian.
..... a doctor.
.... an artist.
.... a tutor.
.... a composer.
вообщем смотри как тебе надо.