Final answer:
In the sentence, 'Mother and father were married by a Judge in 1979.', the words 'O Judge' should be capitalized as 'O Judge.'
Step-by-step explanation:
In the sentence, 'Mother and father were married by a Judge in 1979.', the words 'O Judge' are not correctly capitalized. Proper nouns, such as names and titles, should always be capitalized. In this case, 'Judge' should be capitalized, resulting in 'O Judge' becoming 'O Judge.'
Learn more about capitalization in English sentences