Can kids sing in harmony? Hmmmm.
Don and Phil Everly, The Vienna Boys Choir, The Osmond Brothers (Gasp! originally a very good boys barber shop group) The Mandrell Sisters. Most of these adult groups known for their harmony singing where singing harmonu as kids. Don and Phil Everly and The Mandrells were on radio and TV as kids. The Osmonds (Gasp!) headlined at Disney land for years before they made the Andy Williams show. Even my sons, ne'er do wells tho' they be, sing beatifully in harmony when they think no one is listening.
Don