Yes, there should be two accents.
Please, take a look at my comment about this issue here https://forum.duolingo.com/comment/17640617$from_email%3Dcomment&comment_id%3D31311947
Family is considered to be a collective noun, so it's mostly (if not exclusively) used in singular. While in British English it's sometimes used in plural depending on context (depending on if the speaker refers to family as a whole or not), the course is for American English, and to avoid such ambiguities, we haven't included it in the translations.
(Edit: After further discussion with some native speakers, it was decided that it should be included in the alternatives.)
Keep in mind that this happens with many BE alternatives. Some of them even have different equivalents in Greek, so it's possible that their addition would cause confusion to natives and non-natives.