Wholesale Deal - Power of Attorney - Need advice please

[Greg P.]

Hello all, I'm a wholesaler planning on putting a property under contract. Here's the thing, he live about 5 hours away, and I told him I could fedex or just fax him the contracts. He insisted that he had his brother who lived by the property to show the property and sign the contract since he has power of attorney. How do I go about this? and how can I verify he really is the power of attorney. Any advice would be great! Thanks!