Right of Friend

in the Quran  there is a mention of friends  with along with those and distant relatives they have the following rights.

1. It necessary to make a close observation of the belief, deeds behaviour and dealings,  conduct and  character of those with whom  one intends to make friends. If they are friend right minded  and righteous, they may be befriended otherwise avoided. Great emphasis has been laid on shunning society. experience and observation also expose the harm of bad society. If one come across a person of like habits, belief and character, there is no objection to befriending him, as it recognised universally   that a friend is the greatest source of comfort and solace.
   
2. Never hesitate in sacrificing for him even your life and wealth.
   
3. If some thing unpleasant comes from him connive at it. If some quarrel  occurs by change settle it at  once instead of prolonging it, because even temporary difference among friends have some  pleasant. 
4. Do not be neglectful in wishing your friend well or in giving them good. Give ear to his advice with sincerity and accept it if it is practicable. There is a custom in the Indian sub-continent of adopting someone as a son and conferring  on him all the rights of a real son. In the Islamic Shari"ah an adopted son has no such rights, he has the simply rights of a friend. Such a one has no share in the heritage which is subject to definite laws and his not a matter of someones personal choice.
   
   It is inferred from this that the practice followed in India of debarring  a son from inheritance is invalid the Shari"ah and has, therefore, no legal force.