The Liberal MP hand picked by Prime Minister Scott Morrison to head an inquiry into family law recently presented a paper at a conference held by Hungary's far-right leader about the importance of maintaining birth rates to defend civilisation.

Long-serving MP and former cabinet minister Kevin Andrews presented an address titled "Demography is Destiny: Families and Future Prosperity" in which he called for sustained policy action to address declining procreation in countries where marriage was becoming less popular.

Liberal MP Kevin Andrews and former prime minister Tony Abbott. Credit:Andrew Meares

Meanwhile, Australia's longest-serving Family Court chief justice Alastair Nicholson has joined other veterans of the court to condemn the inclusion of One Nation leader Pauline Hanson as deputy leader of the inquiry.

Mr Nicholson - who led the court from 1988 to 2004 - warned Senator Hanson had given voice to "misguided" fathers' groups who "carry danger with them" and play an unproductive role in debates about family law.