Incorrect. @ the upfronts NBC announced the show. Fox heard about it & quickly produced it. So NBC had to air theirs 1st, & rightly so since fox always steals.
Fox stole from abc :
-f's 'trading spouses' is from abc's 'wife swap'
-f's 'swan' is from abc's extreme makeover (both shows sux, no 1 children have issues accepting their bodies)
-f's nanny911 is from abc's supernanny which abc licensed from UK