Here "house" represents descendants. Manasseh and Ephraim were sons of Joseph, and the "house of Joseph" can refer to the descendants of Manasseh and Ephraim. AT: "The descendants of Manasseh and Ephraim" or "The men of the tribes of Manasseh and Ephraim" (See: [[rc://en/ta/man/translate/figs-metonymy]])
This is background information. Some people who first read this book had probably heard of Luz but did not know that it was the same as the city that they called Bethel. (See: [[rc://en/ta/man/translate/writing-background]] and [[rc://en/ta/man/translate/translate-names]])