Brothers Andrew and Tristan Tate spent their preteen years in the leafy town of Goshen, Indiana. Back then, in the 1990s, the city had some 24,000 residents, plus a large Mennonite population in the surrounding rural area. There weren’t many biracial families like the Tates around, though. In its not-too-distant past, Goshen had been a sundown town .  The sons of Eileen Ashleigh, a white working-class English woman, and Emory Tate Jr., a Black military veteran and skilled chess competitor, Andrew and Tristan were surrounded by extended family growing up. They attended church with their cousins and played together at their paternal grandmother’s house.  Tristan was a quiet boy who came home from church one day and announced he had given himself to Jesus, the Tate brothers’ paternal aunt, Elizabeth Tate, told BuzzFeed News in an exclusive interview.…