Property transfer to legal heir (family member) on death of owner

No.  All the legal heirs except you shall release their rights over the property to you by a registered deed.  Then you can only sell.  It is an expenditure thing. So all the legal heirs shall execute the sale deed in favour of the buyer.

Contact a local advocate and explore the way of disposing of the property through the registered power of attorney on behalf of all the legal heirs.

Execute registered power of attorney in favour of any legal heir or any other person whom you all have trust.power of attorney holder will sale the house and do and complete on behalf of all of you sale proc

Yes, the sale deed could be executed by one of the jointees duly aithorised by all other joint holders.

Who else are the legal representatives of your mother who is stated to have died intestate ? 

Whether the names of LRs have been mutated / registered as owners of the property inherited by them ?

All the owners may execute single sale deed, as advised by expert Mr. P Venu, which I fully agree with him.

Thanks to everyone for their reply / advice.