Haw. Rev. Stat. § 603-21.6: Probate.

The several circuit courts shall have power to:

(1) Grant probate of wills;

(2) Appoint personal representatives;

(3) Determine the heirs at law or devisees of deceased persons and to decree the distribution of decedents' estates;

(4) Appoint guardians for incapacitated adults;

(5) Appoint conservators;

(6) Compel personal representatives and such guardians and conservators to perform their respective trusts and to account in all respects for the discharge of their official duties;

(7) Remove any personal representative or any such guardian or conservator; and

(8) Do all other things as provided in chapter 560.