"For Hashem has made me forget all my previous misfortune and all my fathers house." (41:51)
The usual translation for "Nashani Elokim" is "Hashem has made me forget" this notion engenders a distressful feeling. It seems objectionable that Joseph would be anxious to disassociate himself with his elderly father and all of his family. Rabbi Samson Refael Hirsch zt"l notes that this would explain Joseph's deficiency in getting in touch with his family for such a long time. To state, however that Joseph's heart was so cold is simply preposterous! The various commentaries imply justifiable reasons for Joseph's inaction.
Rabbi Hirsch cites another meaning for the word 'nashani,' it can also mean "to be a creditor" and can therefore mean "Hashem has made my misfortunes and my family into creditors." Hashem has transformed what seemed to be a calamity into the medium for attaining the greatest joy. The realization that one is deeply indebted to his misfortune and his family is the hallmark of greatness. One's objective should be to pierce through the veil of ambiguity that clouds various life situations in order to vividly see Divine Providence directing every step. Joseph Hasadeek was not only righteous in his own right; he was also able to see the righteousness of Hashem's guidance in everything.
We may suggest another thought. Sometimes it is good to forget! Imagine that Joseph went through life with bitter animosity, loathing his brothers for what they had done to him. He would calculate and add every bit of misery to his hatred, until it became insurmountable. This obsessive hatred would have eventually destroyed him. How many individuals and institutions have fallen prey to the effects of hatred? In due time a simple offense can be blown out of proportion. This happens because we refuse to forget yesterday's offense that blatantly glares us in the eye many years later, demanding revenge. Joseph thanked Hashem for giving him the ability to open his arms to his brothers and view their actions in the proper perspective.