1. If a person is not a property owner but is a family member of the property owner can such a person become the member of RWA and will he be allowed to fight elections?
You need to refer to the bye-laws in this regard. By passing a resolution in a general body meeting, the bye-laws can be amended to this effect and can be ratified by the authorities.
2. Is there a specific case law which sets a precedence that such a person can or cannot fight RWA election.
You cannot find a reported judgement in this regard.
These are local issues confining to the society's functions which are stipulated in the bye laws, hence you may not find a case law, even if you find a case law, to this effect you cannot implement it here because that is not law and it can be referred only in the court in case of a dispute arrives at the court in this regard. But remember that each case will be different to each other so any reference also may not be effective in the court.