BY XAVIER ALVAREZ AND MARK REAGAN | STAFF WRITERS Pharr police have arrested two brothers tied to the brutal beating death of their stepfather, who’s accused of sexually abusing his 9-year-old daughter. Brothers Alexandro and Christian Trevino along with Juan Eduardo Melendez, all 18, are accused of beating 42-year-old Gabriel Quintanilla to death Thursday. Quintanilla … Continue reading Police: Pharr brothers beat stepfather to death for abusing sister