The word “uncle” can be capitalized depending on how it is used in a sentence or title. When used generically in a sentence such as: “my uncle said to visit her,” then the word “uncle” is lowercase because it is a generic noun.
Correct: The other day I went shopping with my uncle.
However, when referring to an uncle by name such as “Uncle Jim,” then the word uncle is capitalized because it is a part of the name so it becomes a proper noun. This is also true when asking a question of your uncle.
Correct: My Uncle Jim is the best.
Correct: Can I go to the movies, Uncle?
For more title capitalization questions, use our free title capitalization tool here.