The mother of Tourism Minister and Fianna Fail deputy leader Mary Hanafin was paid €30,000 in compensation following a fall during a visit to Leinster House.
Mona Hanafin took a personal injuries claim, which was ultimately settled, after sustaining an injury in 2007.
The claim cost the taxpayer a total of €62,500 when legal costs associated with the case were added.
The case was settled by the State Claims Agency in early 2009 after a number of courts cases were adjourned.
Ms Hanafin was represented by Paul Kelly & Co, Leixlip, Co Kildare. The company was paid almost €21,000 in legal costs.
Mr Kelly, a former Fianna Fail councillor, was appointed as a District Court judge late last year.
The costs were never disclosed by the Houses of the Oireachtas but are revealed in a wide-ranging Freedom of Information request by journalist Gavin Sheridan from the website thestory.ie.
After 12 months of wrangling, the Oireachtas finally released documents showing spending worth €38,042,971.24 from 2009.
The Houses of the Oireachtas Commission held a Christmas dinner in January 2009 for €625.