This implies that they should have obeyed him. This can be stated clearly. Alternate translation: "I have chosen only you from all the families of the earth, so you should have obeyed me" (See: [[rc://en/ta/man/translate/figs-explicit]])
Here "families" represents nations or people groups. Alternate translation: "all the nations of the earth" or "all the clans on the earth" (See: [[rc://en/ta/man/translate/figs-metonymy]])
It can be stated clearly that they did not obey God. Alternate translation: "But you did not obey me. Therefore I will punish you for all your sins" (See: [[rc://en/ta/man/translate/figs-explicit]])