Last fall a friend and his family, plus another family, crossed the border from Canada spread across two cars. Both cars had a bunch of agricultural products they couldn’t bring in, didn’t declare this, got stopped and searched. Both families, including a couple of members at the same addresses who were not on the trip, got their GE (Nexus actually) revoked. Deservedly so in this case, so not able to get Nexus/GE back.
Have yours and your brothers’ family traveled together recently? Any recent immigration or border crossing issues? Lots of reasons GE can get revoked, but haven’t heard or household or family bans without some connecting reason.