Romney's tax returns do not reflect the income he made on foreign investments (for which he pays ZERO taxes). You have any proof of that, cause I believe the federal government taxes Americans on foreign investments, not to mention the country the investments were made! I believe they are in the tens of millions for the year. Yes, he has shell corporations in the Cayman islands and Swiss bank accounts. His family is loaded, and they have paid a VERy tiny fraction of what they should have. If you want me to cite sources, then you have no business arguing anything because you do not know enough to sound off.
I think it's fair to say that if you can't cite a factual source, you have no business posting it.