1. The sale deed should mention that the property stands in the joint names of your late father, who died intestate and brother and after the demise of your father, his share of the flat has been equally inherited by you and your said brother (provided you have no other siblings and that your mother is no more).
2. It should be mentioned in the said sale deed that your share of sales proceeds i.e. 1/4th of the price will be paid separately in your account while registering the flat.
3.You can ask your brother to get the sale deed drafted accordingly and to send the same to you for your verification.
4. Thereafter, it will be ideal for you to issue a POA in favour of your brother (preferably in favour of any of your trusted person in India if you have any trust deficit on your brother) mentioning exactly the same terms in it based on which the POA has been executed and any deviation from the laid terms will make the POA invalid.
5. Thereafter you should get your the POA notarised before the appropriate officer of the local Indian Consulate.;
6. If there is no other claimant of your late father's share of the flat excepting you and your brother, then you shall have 1/4th of the total price at which the flat is being sold.
7., The your share of the consideration should be deposited/remitted with/to your Bank before the sale deed is registered.
8. However, it will be prudent on your part to execute the POA in favour of some one trusted by you to ensure that you are not cheated and no money is sent to you by your brother after the completion of sale.
9. You can also ask your share from him as advance and then execute the POA in his favour which will be the safest transaction for you.