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We don't address issues dealing with people's dreams. For those issues, we recommend you talk to your local pastor or Confessor, the next time you go to Confession.
The passing of a loved one can be a tough time within a family. I would encourage you to strive to keep a unity among remaining family members, even if you perceive them making poor choices or decisions.
Both my parents passed away and I could tell both my brothers and I tried to be sensitive to the issues each other had.
You will want that family friendship among your siblings in the future rather than a broken relationship which, at best, can be hard to mend.