Hennessy & Drohan at Feddans

Hi: I'm researching Hennessy & Drohan families at Feddans 

I have a letter from Ellen Drohan (nee Hennessy) & John Drohan to Ellens brothers John & Thomas Hennessy in Tasmania in May 1882. The  brothers had been transported 30 years earlier.

In the letter Ellen & John have no children and are living on the remnants of the family (Hennessy) farm at Feddans in a precarious way. Her landlord is Colonel McQuay and she has had to sell a major portion of the farm to Edmond Fitzgerald of Ballygarrett to repay a loan to him. He lives 3 or 4 fields away from them. 

In her letter she says that it has been written by William O'Grady of the Castle, Peggy Moloneys husband.

Is William O'Grady of the Feddans Castle property or from the Mothel-Power Castle property or from Ormond Castle in Carrick on Suir?? Also I'm interested in any information on Feddans Castle, as I've been unable to find anything online

I have no date of death for Ellen or John.

Any  information on this family would be appreciated

Thank- you from Tasmania