SYMPTOMS:
Depressed mood, separation, lacking awareness, addiction...

WHAT TO DO:
Watch his verbal and non-verbal communication; Never leave him alone.
Make family environment pleasing; love and motivate him but never blame / criticize / push; understand his hurdles, needs and intention to take are of those in win win way, cooperate with him to make positive relationships. Assist him to achieve his goals but not your goal, person is born to attain own objectives not of peers and parents. Help him to revise or formulate new target if previous failed. Never discuss family, professional, financial and personal problems in his presence.
Take professional and NLP practitioner's help.

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