Maybe You Shouldn't Show the House to These People
Do you have a friend who lives in a brand new home with a designer kitchen and spa-like baths? He might be quick to disapprove of the Formica countertops and knotty pine cabinets you already know need to be replaced.
Maybe you got the house for a lot less than the listing price. Or you and the seller negotiated an amazing credit to replace the furnace, upgrade the old electrical panel or replace the dry-rot filled deck. Chances are, the people you bring to tour the property won't know, care or perhaps even understand these details. They're just seeing a house and a listing flyer with the price. They don't know the history on how you got there.
The point is, think carefully before bringing someone to see the home you're about to buy - especially if the property needs work or is very expensive. Your well-meaning advisers may reignite last-minute doubts and anxieties you'd already worked through. Without meaning to, they can cause you to get cold feet based on emotion rather than reality.
What Should Agents Do?
Real estate agents, especially the buyer's agent, understand this phenomenon and sometimes are conflicted when their buyers ask to bring someone to a showing. It sounds like a huge conflict of interest because most people assume the agent just wants to make the sale. So for an agent to tell a buyer not to show their parents the home would never fly.
A good agent will accommodate and even encourage you to bring someone to a showing. But the agent will also prep you to take what your friends say with a grain of salt. Only the buyer, the seller and the real estate agents involved in the transaction truly understand all the details of the deal and how it got to its current point. Your agent has been on this journey with you, and a good agent will have steered you clear of enough properties to know this is a good match.