Can I trade in my relatives account after becoming NRI (from foreign countries)?

[TradeXMaster]

@TradeXMaster

Actually, NRI accounts have a higher brokerage, so what if I trade in a Indian account and then transfer it(if I profit from my trades) from India(normal brokerage) to some other country (bank account).

With this statement, Can anyone confirm if there will be any legal problem caused by broker or regulators ?
(Assuming that there is no issues with that relative)