A replacement for the word 'well' that is a reference to the optimistic and wholesome pictures of Norman Rockwell;
Conversational shorthand to indicate that you, your spouse, and your kids are doing fine, and that your life generally consists of being largely consumed by those activities centred around nuclear family.
Particularly useful when catching up with someone you haven't spoken to in some time, and wish to keep the conversation as brief as possible.
Bob: Hey, Joe! I haven't seen you for years! How's your wife and the family?
Joe: Hey Bob. Things are good, nothing really new. We're pretty Rockwell.