Answer:
Step-by-step explanation:
1. Singular Heir: If we assume that there is only one heir mentioned in the context, the phrase could be corrected as "The heir was a real gentleman." This would suggest that the heir is a polite, respectful, and well-mannered individual.
2. Multiple Heirs: If there are multiple heirs being referred to, the phrase could be corrected as "The heirs were real gentlemen." This would indicate that all the heirs possess qualities of being courteous and well-behaved individuals.