Yes — "are" is always capitalized in title case because it is a verb.
"Are" is the plural present tense form of "to be" and is always capitalized in title case styles. AP Style, Chicago Style, MLA Style, NYT Style, and AMA Style all capitalize verbs as principal words in a title.
The word is only three letters long, which sometimes leads writers to incorrectly lowercase it. The short-word rule that lowercases "the," "a," and "in" applies only to articles, conjunctions, and prepositions — not verbs.
APA Style, Wikipedia Style, and Sentence Case use sentence case and lowercase "are" unless it opens the title. These three styles do not use title case at all.
A title like "We Are Family" correctly capitalizes "Are" in AP Style, Chicago Style, and MLA Style. Both "We" and "Family" are also capitalized as a pronoun and noun respectively.
"Are" is a verb form of "to be" and is treated identically to "is," "was," "am," and "were" for title capitalization purposes. Verbs are always capitalized in title case regardless of their length.