(Newser) – An 11-year-old witness to the murder of his mom and older sister testified this week in the trial of the first-degree murder suspect, who's also accused of stabbing the boy, dousing him in gasoline, and setting him, and the boy's home, on fire. The suspect, Ronnie Oneal III, also happens to be the boy's father, and on Wednesday the two faced off during the boy's wrenching 20-minute testimony to jurors, reports FOX 13. Investigators say Oneal, 32, shot his girlfriend, 33-year-old Kenyatta Baron, before beating her to death, then used a hatchet to kill their 9-year-old daughter, Ron'Niveya, who had autism and trouble walking. Oneal is claiming he acted in self-defense after Baron attacked the children. "I just saw my dad holding a shotgun and my mom, like, screaming at him," the boy, also named Ronnie, recalled of the double murder that took place on March 18, 2018, at their residence in Riverview, Fla., a community just outside of Tampa, per the Washington Post.