Here the word "sons" refers to heirs who will receive what the prophets and the covenant promised. Alternate translation: "You are the heirs of the prophets and heirs of the covenant" (See: [[rc://en/ta/man/translate/figs-idiom]] and [[rc://en/ta/man/translate/figs-ellipsis]])
Here the word "families" refers to people groups or nations. This can be stated in active form. Alternate translation: "I will bless all the people groups in the world" (See: [[rc://en/ta/man/translate/figs-activepassive]])