Back in 1997 I wrote an article for this web site where I addressed the question: Can child support arrears be cancelled?" I have now updated that article. It is interesting that the 1996 Ontario Court of Appeal case that I cited back then, is still referred to in the more recent cases. If changing child support is of interest to you, then click here for quick transport to the now revised and updated page at my web site.
You can also reference a 2015 blog post here.