Maryland has 6 Home Inspectors who are members of The Independent Home Inspectors of North America. This means that they do not rely on agent's referals, and therefore are not afraid to report problems which may upset agents who want the home to sell without hitches. Go to their website at www.IndependentInspectors.org to find an Independent Home Inspector in the area.
Avoid the inspectors which are on the agent's preferred lists, as they are usually "agent's pets" and may do a disservice to your parents by playing down or not even reporting problems with the home. For more information about choosing a home inspector visit www.BuyersProtectionService.com/ChoosingInspector