TDS U/s 192

Repayment of Home Loan and its Principal amount is eligible for deduction u/s 80c and Interest part for deduction as a negative income from house property provided home loan taken from recognized financial institution or banks either govt, semi govt and non-govt (private). Loan taken from relative for the purpose of home loan is not eligible for deduction in your income tax declaration/planning.

For interest deduction u/s 24(b) certificate from person from whom loan is taken and the person can be any person.

For principal deduction u/s 80C the loan must be taken from bank or a financial institution. So deduction for interest allowable totally but principal only from banks.

Read the section. It itself says any person for interest deduction. However certificate required.