for future returns.

see this here
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There is no tax on any amount you send to individuals who are your blood relation. These could include your parents, grandparents, siblings and children. Close family, like spouses and in-laws, are also included. However, if an NRI sends money to somebody who is not related by blood, then there is a tax implication. An amount over Rs 50,000 per year is subject to taxation in the hands of the receiver.
Say if money transferred as "maintenance" is used in some investment, like buying a house or investing in stocks or bonds abroad, is there any rule against it? It is to be noted here that once the money is transferred to NRI account abroad, there is no control of resident Indian father, wheather under the option of "maintenance" or under the option of "gift" and therefore, common sense says, that issue is irrelevant from taxation point of view for any party. Please clarify. Which country has highest value for Indian rupee 7 rupees 7 paise in rupees