Explanation
According to the MFDA rules, a Member or an Approved Person cannot accept or act upon a general power of attorney or other similar authorization from a client in favour of the Member or Approved Person, unless the client is a spouse, parent, or child of the Approved Person and certain conditions are met. However, a Member or an Approved Person can accept a limited trading authorization from a client, which allows the Member or Approved Person to execute trades on behalf of the client, but not to engage in any discretionary trading.
Therefore, Josephine can accept a limited POA from her brother, as long as she does not make any investment decisions without his consent.
References = Canadian Investment Funds Course (CIFC) - Module 1: The Financial Services Industry - Section 1.3: Know Your Client (KYC)1 and web search results from search_web(query="power of attorney and mutual fund dealers association rules")23
1: https://www.ifse.ca/wp-content/uploads/2021/08/CIFC-Module-1.pdf