The car park sale in 2003 made a big dint in the amount of money owed.
The first graph shows that in July 2003 Hibs owed various people a total of £14.5m. The largest amount was the mortgage on the ground at £6.5m. The money owed to HFC is money that has essentially been loaned to the club by Tom Farmer/Rod Petrie.

In 2004 the car park was sold bringing in a net 9.3m for HFC. Consequently the amount Hibs Football club owed to HFC was reduced by £4m.
The graph below shows who the money is owed to now. The mortgage is being paid off in two ways. £2.5m will be paid off in 2020, the rest is being paid off at the rate of £20,000 per month. The interest rate is noted in the accounts, however £240,000 looked to have been paid, and the amount owed reduced by £240,000.
The money owed to HFC is £250,000 and this is "repayable on demand".
For a history of how money has moved between the football club and its holding company look at the 2008 results.
Hibs - Debts