Question

Which sentence has a capitalization error

(1) Katie has an unusually large family.
(2) She has three siblings.
(3) The siblings include one brother and two sisters.
(4) She has six Aunts, five Uncles, and fifteen cousins.
(5) Katie's grandmother lives with Katie's family, and Aunt Linda lives next door to Katie

Answer 1

In (4) aunts is a common noun and doesn't need to be capitalized.
In (5) it's used as a title together with a name and so ,it should be capitalized

Answer 2

Number 4: She has six Aunts, five Uncles, and fifteen cousins, has a capitalization error.

Aunts and Uncles should be lower cased because they are common nouns. They describe the people who are the aunts and uncles. However, if you had a name that followed aunt (like in number 5), then Aunt and the name of the person would be capitalized because it is a title of a person and it becomes a proper noun.

Hopefully this helped.