All five children of fallen Irish billionaire Sean Quinn, who was once Ireland's richest man, and three of their spouses will reportedly face cross-examination about their assets in the Irish High Court this week.

According to the Belfast Telegraph the Fermanagh businessman's sons-in-law Stephen Kelly and Niall McPartland, as well as Karen Woods — the wife of Sean Quinn, Jnr — will be questioned about missing millions in rent money allegedly generated through the family's international property group (IPG) as well as the significant salaries they received from Russian companies.

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The Irish Bank Resolution Corporation (IBRC), the now state owned body that was formerly Anglo Irish Bank, froze the Quinns' accounts last July and disputed claims that they have provided full disclosure of their accounts and assets.

The bank also reportedly wants documents relating to control of companies in IPG, as well as assets, bank accounts and documents relating to salaries from Russian IPG companies in 2011 and 2012.

Last summer, Quinn's daughter Aoife said their family did not have a 'pot of gold' hidden away, even though members of the family had drawn down almost $4 million in salaries from a Russian company since 2011.