302-4.202—Are there any circumstances in which a per diem allowance for my immediate family members is not allowed?

Yes, per diem for your immediate family members cannot be authorized if you are:
(a) A new appointee;
(b) Assigned to posts of duty outside CONUS returning to place of actual residence for separation; or
(c) Being relocated under the Government Employees Training Act (5 U.S.C. 4109 ).