An Illinois couple whose two young kids tragically drowned after their boat capsized during a massive storm that ripped through Wisconsin’s Geneva Lake were “lifelong, experienced boaters,” friends and authorities said. Caleb Oswald, 6, and Abigail Oswald, 7, “were more than brother and sister—they were best friends,” wrote the tots’ father, Brad Oswald, on a charity Gofundme. “They filled our home with laughter, music, hugs, and endless love. They were deeply loved by their family, friends, teachers, and everyone who had the privilege of knowing them.” Investigators determined the children, whose names were released this week, died by drowning, with…