Answer:
His father
According to the speaker of Dylan Thomas’s poem “Do not go gentle into that good night” , his father should fight harder against death.
Step-by-step explanation:
The speaker is a son talking to his ageing father and making pleads in front for him to fight against death. It is a known fact that death is inevitable but son asks his father to not give up on death in an easy manner. The message of the son is reinforced with the help of his father.