M.M.
My kids never whined because I refused to let them get away with it, but my grandson (5 yr) and both of my bonus children whined (they were 9 & 5 when we married). My husband and I would just look at each other and say "Did you hear something?" The other would respond "I think so. Oh it must be whining! We don't understand whining!" We treated whining like a foreign language. They learned very quickly that they did not get anything when in whining mode.