Why does it mention that Menasheh and Machir were the Bechoros?
Rashi: This is why he was first to receive, in the days of Moshe, in Ever ha'Yarden.
Radak: He was the Bechor of Yosef's Bechor. Due to his strength, he (his sons
The verse attributes more [Gevurah] to Efrayim than to Menasheh
Why does it say that Mechir was Gil'ad's father?
Bi'ur ha'Gra: Mechir took Bashan, and his son Gil'ad took Gil'ad.