Income received outside india

One of my family member has gone for employment to oman and receives salary in bank account opened in bank of that country. He transfers some of the portion of his income to his NRE account to India. As per the income tax act he is Resident for FY 17-18. So for calculation of tax on income received in oman do I need to consider only the amount transferred to NRE account or total salary received in the account opened in oman? Kindly provide your views on above situation.