The Coalition says it is prepared to give Prime Minister Julia Gillard the benefit of the doubt over claims she was involved with the mortgage on a property partly paid for with stolen union funds but says it is time she finally gave a ''candid explanation''.

The Opposition Leader Tony Abbott on Saturday said the coalition would use the last parliamentary sitting week of the year to grill Ms Gillard over her integrity as a Slater & Gordon solicitor in the 1990s.

Coalition mission ... Tony Abbott will demand answers from the Prime Minister. Credit:Alex Ellinghausen

''The claims are coming from many sources. These questions are coming from many sources,'' Mr Abbott said.

''I am prepared to give her the benefit of the doubt but in order to give her the benefit of the doubt we've got to hear her side of the story.''