Family Member Broker - Managing Mother's Investment

External question — Personal Finance Stack Exchange Author: Katherine Original post: https://money.stackexchange.com/questions/150305 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. My niece works for a securities firm as registered broker, (not CFP) - her mother, my sister, inherited a large sum of money and will be investing 100% of her funds with her daughters business. Is this a conflict of interest?