Final answer:
The interpreter will need to use consecutive interpreting and sight translation modes in this case.
Step-by-step explanation:
The interpreter will need to use consecutive interpreting and sight translation modes in this case. Consecutive interpreting involves the interpreter listening to one person speak, then translating their message into another language while the speaker pauses. This allows the parents to understand what the neurologist is saying. Sight translation refers to the process of orally translating written text in real-time, ensuring that the parents can comprehend any written instructions or explanations given by the neurologist.