Can I manage my friend's accounts through my IBKR Canada Family master account?

You can only manage a maximum of 5 close family members if you are a non-registered individual.

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How can I set up and manage a family member's account using a non-professional family account?
What is an “ISA Family Account” and why do I need one?
Can I refer a family member to the Refer a Friend promotion?
Can I increase the number of family member sub-accounts I manage in my IBKR Canada Family Advisor account?
What is the limit for the number of accounts which can be under the family structure in Canada?