A guardian cannot act in the capacity of both buyer and seller.

Explanation

A guardian cannot act as both buyer and seller in the same transaction — the duty of undivided loyalty to the ward forbids the trustee from occupying both sides of a dealing.

Where this applies

• A court-appointed guardian for a minor tries to sell the child's property to himself — the court blocks it because a guardian cannot sit on both sides of the transaction.
• A conservator managing an incapacitated person's estate attempts to buy the ward's antique furniture at a low price, and the deal is voided.
• A legal guardian auctions off her ward's car and then bids on it herself — the law forbids her from acting as both seller and buyer in the same deal.