Not Moses' Son.
Pinchas (Numbers 25:10-30:1 )
"Moses placed his hands on Joshua" (Numbers, 27:22). One of the signs of a great leader is the ability to do what is best for his people, not what is best for himself or his family.
Rashi explains that as Moses approached the end of his life, he hoped that one of his sons would succeed him as the leader of the Jewish nation. God, however, had different plans and told him that Joshua would be the next leader.
Interestingly, Moses immediately accepted the decision and, rather than appointing Joshua with inner resentment and ill will, he showered Joshua with blessings, going far beyond what God had asked him to do.
True leadership involves the recognition that it is less important who does the job than getting the job done properly.