My cousin, william, won tickets to see the lion king on broadway.

William, The Lion King and Broadway are what needs to be a capital?

Correct.

Thanks

You're welcome.

When it comes to capitalization, there are certain rules to follow. In this case, "William," "The Lion King," and "Broadway" are all proper nouns and should be capitalized. Proper nouns refer to specific people, places, or things and are always capitalized. It helps to remember that if you can replace the word with a specific name, it should be capitalized.

So, in the sentence you provided, "William" is a proper noun referring to your cousin's name, "The Lion King" is a proper noun referring to the title of a specific Broadway musical, and "Broadway" is a proper noun referring to the specific location or street in New York City where many theaters are located. Therefore, all three need to be capitalized.