Do we know anything about Moses’ descendants? Did they enter the Land of Israel with everyone else?
After the Jews left Egypt, Moses’ sons (Gershom and Eliezer), along with their mother (Zipporah) and grandfather (Jethro), rejoined their father in the desert. This is the last overt mention of Moses’ sons in the Torah.
In fact, when the time came to choose a successor for Moses, our Sages relate that Moses requested one of his sons be appointed. G‑d responded, “Your sons sat and did not occupy themselves with Torah. Joshua, who served you, is fitting to serve Israel.”
And while Moses’ physical progeny did not live up to his example, Aaron’s sons—who succeeded their father as priests—did carry on the noble traditions of their father and uncle. G‑d considered Moses’ nephews as his children, for he was the one who taught them Torah. This is reflected in Numbers (3:1), which begins “These are the descendants of Moses and Aaron…” but only lists Aaron’s four sons.
Thus G‑d reassured Moses, explaining that even Joshua would need to confer with Aaron’s son, the High Priest, to know G‑d’s will.
Rabbi Menachem Posner
Ask the Rabbi @ The Judaism Website – Chabad.org