1. in the POA granted by wife to her husband, check if there is a power to substitute
2. if such power is there, then husband can grant POA to the agent to act on behalf of both husband and wife
3. that is, husband has granted power to agent to acct on his behalf and also on basis of the POA granted by wife to husband containing a power to substitute, the husband has substituted himself and granted POA to agent who can also act on behalf of the wife for her share in the property
4. check in the POA granted to agent whether there is a power to sell and to receive consideration
5. check whether consideration is passed to the husband and wife by the agent
6. in the sale deed, the agent can become a vendor, the husband and wife as confirming parties and you will be the purchaser
7. you will now pay consideration to the agent and the agent will transfer his right to you and this transaction will be confirmed by the husband and wife as confirming parties