A school community is mourning the loss of a beloved teacher and his son in a boating accident that killed five people in a Georgia river over Memorial Day weekend, multiple outlets report. Four of the five victims were members of the same family. Christopher Leffler, 51, and Nathan Leffler, 17, were among those killed when two boats collided on the Wilmington River near Savannah on Saturday, May 28, McClatchy News reported, citing the Georgia Department of Natural Resources. Christopher Leffler’s wife, Lori Leffler, and their 23-year-old son, Zachary Leffler, also died in the crash, as did Ro…