Question

I sent a thank-you note to aunt Elaine, but not to my other aunts. What is suppose to be capitalized

Answer 1

You need to capitalize Aunt

Answer 2

The word that should be capitalized is aunt, in front of Aunt Elaine. This is because aunt in front of a name is a title, or pronoun, which means it needs to be capitalized. However, if you did not put a name behind aunt, you would not need to capitalize it because it would not be a pronoun.
Hope this helps! Have a happy holiday!