Appreciate your answer! It appears that they need not file the 706 since it's below the threshold.

However, they need to file 1041 because the estate generated income above $600. I'm quite confused whether this would be a joint filing or a separate filing of 1041. The wife died last Dec 2015 and the husband Dec 2017. The husband and wife had properties owned separately. They also had properties owned jointly. These properties are to be distributed to their children. The agreement, however, specifically indicates which properties (are to be distributed) along with the name of the beneficiaries.

Should I prepare 2 returns? For 2015 (Wife) and 2017 (Husband)? Or should I just make one joint return in 2017? Any thoughts are highly appreciated. Thanks!‌‌