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The file is Tab Delimited.
Are these the URL formats you use in visible links on your site, so users would click them?
When you say "redirecting to an error page" do you mean that literally-- a 301 kicks in-- or do you mean that you end up seeing an error page?
Using an extension such as Live Headers will let you see what's happening at each step.
It looks as if you have two different pages redirecting to the same page.
Both family.php/3031 and product.php/3031 end up redirecting to an error page.
The page their being directed to does exist and is accessible if I enter the URL.