Rs. 25,000/- [inference sub-sec. 80D(2)]

The assessee will not get deduction as his father is a non - resident as per the Explanation given for very senior citizen in Section 80D for F.Y.2017-18

https://www.incometaxindia.gov.in/pages/acts/income-tax-act.aspx

Saw the Solution given by ICAI,from that I think its being said that the extra benefit of 5000 which a resident senior citizen is getting will not be there for non resident senior citizen.

25000 additional deduction of rs 5000 for senior citizen will be available only if they are resident in the previous year for which you are claiming deductuon under section 80d