What's this movie called?

It's a kid movie tha ti dont know the name of. It's about these two kids boy and gil brother and sister who are invisible to everyone but this one lady who has no colors. the lady is in a white gown thing with black lines cause all the colors disappeared. She has to get all the colors to be friends again to get all her colors bakc. some seens include the men with the beards that sing there once was a man named michael finnagen.. also a scene with the firemen people and the father and dad that are both red and they ahve their bay in one of the daughters hands and even younger children that get up and dance while the parents sit down. Theres also and invisible dog called wishbone?.. also a chest nut gets into a fight with a tree. pleas ehelp what movie is this?