 Christine Campbell is a recently divorced mother who runs her own gym, for other working woman who come to work out 30 minutes. She brings her boy Richard Jr.  Richie  to his new, exclusive school on the first day of third grade, and finds it impossible to make him -or his in-living uncle Matthew- share in her excitement. She quickly finds the other mothers are wealthy and spoiled, looking down upon working class. Her ex Richard Sr. Campbell is there too, and not only suggests she brought the kid more for her own ego then for his future, but is seen on the parking lot, kissing his new girlfriend, also called Christine, who offers to be addressed as Chrissie but is called by the snooty mothers New Christine, making Ritchie s mother  Old Christine  (hence the title). One consolation: the kid made new friends already.