Answer: nonrestrictive
Step-by-step explanation:
An adjective clause, is also referred to as the relative clause, and it is a dependent clause that describe the noun in a sentence.
The adjective clause in the sentence "My brother who lives in Hawaii is a surfer" is nonrestrictive. An adjective clause is said to be nonrestrictive when we know the person or thing that's being written about without the adjective clause. The function of the nonrestrictive adjective clause is just to provide an additional information.