Just like anyone else in life, you need to rid yourself of people who will bring you or your family down. If they are a sibling, so be it.

The sooner this is learned the better.

"...aspire to live quietly, and to mind your own affairs, and to work with your hands, as we instructed you, so that you may walk properly before outsiders and be dependent on no one." - Paul to the church in Thessalonica.