Need urgent help_dda plot to be alloted to deceased g'mother

Hi,

I need urgent help, ready to engage good laywer for this dealing.

My deceased Grand mother had applied for DDA freehold plot which has come out in draw now. She had 4 Sons ( 1 alive + 3 deceased as of now) and 3 daughters ( 2 alive + 1 deceaded as of now).

Now DDA is asking for depositing the allotment money and papers for alloting the plot  to any/all of alive child of my grandmother.

I am the son of her(Grandmother's) deceased son and my only alive uncle is asking for my father's original death certificate and my signatures for Special POA. I have 4 sisters to share with as well.

I need advice as to whether what my uncle is asking is legitimate and is there any risk of his selling that plot after allotment by DDA ? What should be the ideal course of dealing with this as well are interested in disposing the plot and realising the premium on it.

Please advice and also kindly give you contact details.

Thanks a lot in advance.

Warm regards.

Sd/-