Son contrinution to father house

1. Father is not liable to pay any type of Taxes, on any amount received from his Children, since this will be deemed to have been received as a Gift, unless the Children shows it otherwise, at times of legal dispute.

Keep Smiling .... Hemant Agarwal
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Father has to show this as lending from his son and can claim an exemption under income tax by showing some interest and can also secure his own property as his exclusive and not joint family property.  The conditions between the parties on the treatment of this amount is crucial.(Lending for a period which must be repayable, or gift or contributions to his family with a right on property proportionate to the total expenditure etc.,)

Hello Venkat
Both the Above options are valid you can either show that some have gift to his father which exempt us section 56(2)(×) of income tax ..
or as a loan but the former is more advisable