Step 1: Identify the statements made by each person and the relationships between them (who tells the truth and who lies).
Step 2: Create a truth table to keep track of the truth-telling status of each person based on the statements provided.
Step 3: Start with the person mentioned in the question (e.g., Jim, Dallas, Gwenn) and determine their truth-telling status based on the statements made by others.
Step 4: Use the truth table to evaluate the truth-telling status of each person mentioned in the statements.
Step 5: Determine if the person mentioned in the question (e.g., Jim, Dallas, Gwenn) tells the truth based on the evaluation from the truth table.
Step 6: Output "Yes" if the person tells the truth, or "No" if the person does not tell the truth.