If someone has power of attorney, can they execute a document that they will profit from?

Question Details: My niece has power of attorney over my parents. Her husband is a realtor and not a very good one. She got my parents to list the property in their estate which will be left to their 3 daughters, with her husband. There is a shopping center complex, mini storage facility, office building, subdivision lots, also other building lots elsewhere. The nieces husband also receives commissions off of rentals in the office building. Is this not a conflict? Is it legal for someone with POA to execute a document that they will profit from?

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