It sounds to me as if this is a question that could be best answered by an instructor. I say this because the instructor would be able to fully expand as to for what elements they seek to see in your answer. In my own mind, the Garoghlanian tribe is referring to the cultural setting of Saroyan's short story, "The Summer of the Beautiful White Horse." Aram is a member of an Armenian family named the Garoghlanian tribe. It can also be taken to refer to the Armenian cultural context of the story. It is a community that has been displaced. Presumably, this group arrives in America, specifically around Saroyan's own experience of Fresno in California, and seeks to establish their own identity in a world that is not their own. In my own mind, I cannot but help to see the Garoghlanian culture as a displaced group from Armenia after the Turks had massacred millions of their fellow country men, women, and children. Enduring this trauma to their people as well as being compounded by a lack of international response and an acknowledgement from the Turkish government caused many Armenians to emigrate to different parts of the world in an almost rootless existence. The Garoglhanian tribe presented in Saroyan's story seeks to establish some roots, some bonds, and some hope of permanence in a world that has done a great job of forsaking such elements for the Armenians. It might be due to such a cultural pain that Uncle Khosgrove continues to say, "It is no harm, pay no attention to it." I wonder who would be better than an Armenian, with the stain of genocide forever embedded upon his culture's soul, to say to so many, "Pay no attention to it."