Final answer:
The twins in 'The Two Sons' poem experience physical symptoms of fear such as sweating, increased heart rate, and trembling. There is no specific remedy provided within the poem or the given reference. Remedies in literature often come from emotional support or self-realization.
Step-by-step explanation:
The question pertains to the physical symptoms produced by fear in the characters, the twins. According to the text titled The Two Sons, the twins experience extreme anxiety and fear while on their boats, which is a common emotional response in stressful situations. The symptoms of fear can include sweating, increased heart rate, trembling, and a sense of panic. Since the actual remedy is not provided within the poem or in the reference given, we cannot accurately say who provides a remedy for their symptoms. However, it can be deduced that in literature, emotional support from a family member, friend, or an encounter leading to self-realization can often act as a remedy for characters experiencing fear and anxiety.