LANCASTER COUNTY, Pa. - rty-one years ago, when Earl Hess became president of Hess Home Builders, residential construction was on the verge of a major downturn.Now as his son Randy Hess prepares to assume the reins of the family business, the industry is again struggling.But it's the ability to adapt to economic vicissitudes and changing consumer demands that has allowed Hess Home Builders to survive and thrive for the past 45 years, father and son say.As the younger Hess takes over next spring, he'll be facing a different set of challenges than his ...