Check out motivational speaker DeVon Franklins' intervention tips.
The key to a successful intervention is the breakthrough. The breakthrough is the moment when the person you're intervening with clearly sees the error of their ways (in a way they hadn't before) and is determined to make a positive change to correct the problem, which they have been resisting to correct before. Here are some helpful tips if you feel that a family member, friend or loved one needs an intervention.
Don't Judge or Condemn
Condemnation doesn't produce change. Compassion does. So, refrain from making judgmental statements. If the person you are trying to intervene with feels judged by you, it won't work.