I believe Provo’s ordinance reads (Provo Code 14.06:)
"“Family,” unless otherwise expressly provided in this Title means:
(a) One (1) individual living alone; or
(b) One (1), but not more than one (1) at the same time, of the following groups of individuals described in subsections (i), (ii), or (iii) who together occupy a one-family dwelling unit as one (1) nonprofit housekeeping unit and who share common living, sleeping, cooking and eating facilities:
(i) A head of household and:
(A) All persons related to the head of household as a parent, child, grandparent, grandchild, brother, sister, uncle, aunt, nephew, niece, great-grandparent or great-grandchild by blood, marriage, adoption, guardianship, or any other duly authorized custodial relationship; and
(B) Not more than two (2) additional related or unrelated persons, including but not limited to, personal care or personal service providers; or
(ii) In R1 zones located within neighborhood areas described in Subsection (c) of the definition of “baching singles” in this Section, two (2) related or unrelated individuals and any children of either individual, if any; or
(iii) In all other zones, three (3) related or unrelated individuals and any children of either individual, if any."