Much like when a younger sibling beats an older sibling — it’s not likely to happen twice in a row. That was the case Wednesday night at Albert Ali Gymnasium when the Nevada Union Alumni team avenged last year’s last second loss by beating the 2012-13 version of the NU basketball team. Behind Kelib Thompson’s 18 points and a 15-4 run down the stretch, the Alumni team topped the Miners, 70-59. “It was definitely tougher this year,” said senior guard Ian Davis. “They stacked it.” The Alumni team boasted a young and athletic group of former Miners and got out …