What do the last 7 lines mean?I'm not too sure if all these lines are referring to the father of the narrator.
In many vilanelles, with their complex pattern of repetition and rhyme, the refrains serve mainly as a chorus. However, in Dylan Thomas's "Do Not Go Gentle Into the Night," the refrain is an integral part of the poem that is a plea to his dying father, David John Thomas, to rail against death. In the poem, Thomas discusses how the wise, good, wild, and grave men meet death. The wise have too much yet to say, so their life goals have not been accomplished. Like the wise men, the good have not accomplished all they desire; they cry both in the sense of calling out to others and in their regret that they have not accomplished what they wanted.
On the other hand, the wise men have made much of their lives, having "caught and sang the sun in flight," these men have lived passionately and joyously. Since Thomas's father was a perceived as a wild, Celtic bard, the words of the third stanza seem prophetic. Now, in line 7, the grave men are those who are prepared to die. Having lived seriously, they "see with blinding sight"; that is, paradoxically, they are able to perceive things more clearly than those with sight. The mention of blindness pertains to Thomas's father, who has lost his eyesight.
After he finishes telling his father about these brave men, the speaker addresses his father in apostrophe: "And you, my father, there on the sad height.... "He supplicates his father to bless him with tears of passion, and curse him, too. This verse if much like those in the Bible, of parallel structure they often contain both curses and blessings. And, also Biblical is the repetition of the refrain.