We can draw a theme from parashas Bamidbar through the beginning of Beha’alosekha.In Beha’alosekha, Moshe and Aharon count the Jewish People “according to their families, by their father’s household” (1:2), divided by sheivet. Sheivet is defined patrilineally. Membership in the Jewish People as a whole is matrilineal, though. Why? We also find this asymetry in a law mentioned later in that parashah — pidyon haben. While the father’s oldest child gets twice the inheritance of his other children, when it comes to the sanctity of the firstborn, and the need to redeem it, it’s the mother’s firstborn that is holy.We see a hint to the difference in a verse, “These are the children of Moshe and Aharon; the children of Aharon are…” The medrash explains that Aharon’s children are the children of Moshe, their mentor, as well. (Unlike Moshe’s own children, who did not follow their father as their mentor