Is power of attorney necessary

1.  IF the "Purchase Agreement"  mentions TWO names, THEN both parties have to sign on the "Sale Agreement".  The Society membership Share Certificate has no relevance, at all, as far as ownership of property is concerned.

2.  In case instant, the Uncle and the Legal heirs of deceased father,  both have to sign the currrent Sale Agreement, AFTER following due proceedure of law.  It would be a Criminal Offence to sell such property with only one signature

Keep Smiling .... Hemant Agarwal
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 A Power of Attorney was given by Mr. D to Mr. B to act on his behalf in a particular transaction.
If Mr. D himself acts in this Transaction without cancelling the Power of Attorney , will it be considered as revocation of Power of Attorney given to Mr. B

Thanks. There was no Power of Attorney. The Agreement shows signature of my father as CA (constituted Attorney) to my Uncle. As POA does not exist at all, is my Uncle's name legally valid as 2nd holder? My Uncle has not signed any document about this flat.

Thank you very much. 1) My father had signed the Agreement as CA (constituted Attoreny) to my Uncle. But there was / is NO Power Attorney given. So, is my Uncle's name as 2nd holder legallly valid? Does he get 50% right? 

2) Can my Uncle sell his 50% right (if at all) to any 3rd party and can the new Buyer stay with us in the flat?!!!! Or, vice versa.