Deputies say Joshua David McEachern was charged Tuesday with attempted murder and possession of a weapon during the commission of a violent crime.
A judge on Monday denied bond for McEachern on a murder charge. Authorities say the teen shot his mother and brother Sunday night at the family's Greenville home after an argument, then called authorities to report the shooting.
Deputies say the teen shot 59-year-old Kathy McEachern in the face, then shot 21-year-old Daniel McEachern multiple times in the chest. Deputies say they have interviewed the brother, who is still hospitalized.
It was not clear if McEachern has an attorney.