ויאמר יוסף אל אחיו אני יוסף העוד אבי חי (ויגש מה:ג)

Why does Yosef say here, אני יוסף and later on, it says (ויאמר אני יוסף אחיכם (מה:ד? Yosef wanted to show his brothers that he was a pious Yid all his years in Mitzrayim. However, his brothers sinned by selling him, so they weren’t ‘brothers in Mitzvahs.’ That’s what Yosef said אני יוסף... But later on, when Yosef saw that his brothers were shamed and Hashem forgave them, they became אני יוסף אחיכם brothers.