DENVER (Reuters) – The mother of a Colorado boy thought to be aboard a homemade helium balloon has admitted to investigators the whole thing was a hoax, according to a court document made public on Friday. ... "The motive for the fabricated story was to make the Heene family more marketable for future media interest," the affidavit states. The document also says the Heenes, who had starred in the reality television show "Wife Swap," had devised the hoax about two weeks before and had instructed their three children to lie to authorities and the media.