tohot2se -- you're right about a chain park being owned by the same parent company, hence, Cedar Point / Knott's / Michigan's Adventures would all be part of the "chain," but I see chain parks as having a lot of similarities: ride themes, names, types, signature characters and/or items (food, etc.) stuff like that, which the Cedar Fair "chain" doesn't seem to. If you went to MIA and CP, you wouldn't be able to tell BOOM! right off the bat that they're related, other than there's probably a sign or something. :)
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/