Friendship is different from all other relationships. Unlike acquaintanceship, it is based on love. Unlike lovers and married couples, it is free of jealousy. Unlike children and parents, it knows neither criticism nor resentment.
Friendship has no status in law.
Business partnerships are based on a contract. So is marriage. Parents are bound by the law, as are children. But friendship is freely entered into, freely given, freely exercised. Friends never cheat each other, or take advantage, or lie.