Section 16.04.18.504 - STAFF RATIOS AND GROUP SIZE01.Staff Ratio. Each group of children must have one (1) staff for every four (4) children. Where there are four (4) children or less there must be at least two (2) staff.02.Interns and Volunteers. Interns and volunteers must never be counted in the staff ratio and never have sole responsibility to supervise the child.Idaho Admin. Code r. 16.04.18.504