Who is Sarosh / Sid from Swimming Lessons and what is their importance?

In "Squatter," Sarosh (he rejects the Western version that he adopts when he first emigrates to Canada) is the tragic protagonist in a story told by Nariman Hansotia to boys who consider emigrating At his going away party, Sarosh declares that if he fails to assimilate completely, he will return home. His mother makes him swear to this on the Avesta. In Toronto, Sarosh finds a job and apartment, but is never able to move his bowels while seated on the toilet in Western fashion.