How to understand the fantasy drifting of juvenile Pi?

The fantasy drifting of Pi is a metaphor: there are no animals in the lifeboat, the disabled zebra is a sailor from China, the orangutan floating on the banana is the mother of Pi, the tiger Richard Parker is Pi, and the hyena is Pi's father, not a chef. The mouse eaten by the tiger is Nandi, Pai's girlfriend. This tooth is Nan Di's. The story told in the film is actually like this: an immigrant family was sent, and young men and women were reluctant to part, and they were sent to hide their girlfriends in lifeboats. After the cargo ship crashed, Pai and his family boarded the lifeboat where his girlfriend was hiding to escape. China sailor followed and broke his leg in a hurry. After drifting at sea for a long time, the first non-family China sailor starved to death and was the weakest. The only food on the lifeboat was also given to his family. Then the wise father cut off the flesh of China sailors and went fishing. Bai and his mother are both devout believers. They refused his father's practice and refused to eat without knowing the danger. Once, after a big fight with my father, my mother was very angry. Suicide, Pai accidentally killed his father in excitement, but the father who loved his son gave up his resistance in the grief of losing his beloved wife. The ensuing drifting hunger kept coming, and Pai, who was dying, had to kill his weak girlfriend like his father and fish with his girlfriend's meat until he was finally rescued.