Now you have your answer Bahamas guy on how Joseph could not have been recognized by his brothers when in Egypt, he would have easily blended in!

Not to mention this,

And Joseph knew his brethren, but they knew not him. It being about twenty two years since they saw him, and then he was young, and his beard not grown, as now it was; and besides, he was clothed as a prince, and spoke the Egyptian language; and being in such great grandeur and splendour, and in such power and authority, and having such a retinue attending him, they never once thought of him, whom they supposed might be dead, having never heard of him all this time; or, however, it could not come into their minds, that he whom they sold for a slave could ever be governor of the land of Egypt.