Trading money of family members and relatives

Are there any processes I need to follow before I take money from my immediate and extended family, and trade on their behalf? Any licenses, tax liabilities, rules etc. I should be aware of? I was told that I will need a broker's license first before I trade someone else's money. Is it true?

Please clarify. Thanks.

Just FYI, I want to do algo trading, using Zerodha or IB APIs.

Trading money of family members and relatives