IRC 170 just says
(j) Denial of deduction for certain travel expenses No deduction shall be allowed under this section for traveling expenses (including amounts expended for meals and lodging) while away from home, whether paid directly or by reimbursement, unless there is no significant element of personal pleasure, recreation, or vacation in such travel.
It does not spell out explicitly that the deduction is denied when it is for expenses of a dependent. Maybe there are court cases on the issue. =================== As long as the dependent doesn't file his/her own tax return and is also claimed by the taxpayer taking the out-of-pocket contribution, I would say that the deduction is safe (with respect to the comment above).