The boys' parents Donna O'Connor and Anthony Mummery, from Churchdown, Gloucestershire, have now warned others about the risk after their children attempted the stunt twice during one weekend in November.
Mr Mummery, 32, said: "I felt sick and worried when I heard what they'd done. It could easily have been a phone call saying my sons are in hospital or they've died. They have been punished more than I have ever punished them before. It's shocking that kids are able to watch videos like that."
When contacted by The Mail on Sunday, Facebook took down two of the videos. However, last night many more were still accessible on YouTube.
Warning: explicit language
Last year, a 15-year-old American boy was reportedly burned to death after his entire body was engulfed in flames.
A London Fire Brigade spokesman said: "This is a stupid and dangerous craze. You're almost certain to seriously injure yourself, and fire can easily spread to furniture and other flammable household items which is a risk to others."
- Daily Mail UK