A home inspection is an opinion usually by somebody with some training and expertise but not always.

Buyers and agents sometimes use it to negotiate a better price.

You don't have to agree to anything but they can also choose to walk at that point it's a negotiation

Thank you for your response. It just seems unusual and I wonder if I need to be concerned that he isn’t licensed or anything.

In my area, a home inspection clause in the contract gives the buyer the right to terminate the contract if the inspection finds issues not visible. If a buyer wishes to terminate the contract based on the inspection results, the inspector must have a license.  A licensed tradesman's opinion can be used for negotiation but only for the scope of their license. An informal assessment by a friend, relative or contractor has no legal standing

No license in CA except pest inspections. Check local/state regs. Your agent/broker should advise.

There is no license requirement for home inspectors in my state, so who inspects is irrelevant.

There is a license requirement in my state of Florida, however that is only if you are representing yourself as a home inspector.

Some concern about liability if he breaks anything.

My only concern is if this person is not trained to understand what he can and cannot do during an inspection in regard to operating equipment in your home, moving furniture or access panels or returning all systems to normal when he's finished. I do not think I would want an unqualified person attempting to "inspect" my home if they do not understand how to do it.

Kristin Petro, thank you, that is also my concern.

What does your agent recommend? Are they concerned about potential problems? The market in my area is cooling quickly, so I wouldn't want to lose this potential buyer. If your agent is willing to be present for the inspection, I would allow it. 

I know someone whose lawyer advised that he not allow the buyer's electrician to evaluate the house. The initial inspection pointed out concerns and the refusal caused the buyer to walk. Ultimately the electrical issues cost the seller a significant amount of time and money which might have been minimized with a bit more flexibility from the seller

Why don't you be present for the "inspection" since this is not a licensed and insured individual?

I was present for the “inspection”, which turned out to be more like a showing. Thankfully my fears were unfounded in this case.

I appreciate all the comments.

Thanks for the follow-up

As suspected.

It's on the buyer to hire (and pay) the inspector. It has nothing to do with you at all. If buyer and relative decide to move ahead and buy the house, so be it. Just make sure your closing attorney is apprised of the situation.