Minn. Stat. § 145C.03
Subd. 1. Legal sufficiency.
To be legally sufficient in this state, a health care directive must:
Subd. 2. Individuals ineligible to act as health care agent.
(b) The following individuals are not eligible to act as the health care agent, unless the individual appointed is related to the principal by blood, marriage, registered domestic partnership, or adoption, or unless the principal has otherwise specified in the health care directive:
Subd. 3. Individuals ineligible to act as witnesses or notary public.