41 CFR § 302-4.206
How much per diem will my immediate family receive?
June 9, 2020
Immediate family members age 12 or older receive three-fourths of your per diem rate, and children under 12 receive one-half of your per diem rate.
Immediate family members age 12 or older receive three-fourths of your per diem rate, and children under 12 receive one-half of your per diem rate.