The elderly parents of Stuart Robert were temporarily handed responsibility for a company established by their son, raising fresh questions about whether the Turnbull government MP may have won previous elections in breach of the constitution.

The former minister has been under fire after Fairfax Media last week revealed he had direct financial links with a company awarded millions in federal government work. Section 44 of the constitution forbids MPs from profiting from the Commonwealth.

Stuart Robert in Parliament House in Canberra. Credit:Andrew Meares

Mr Robert only resigned his directorships and offloaded his shares in his GMT Group in 2010 – three years after he was first elected to Parliament. The Queensland MP told Fairfax Media he structured his affairs in a way that did not breach the rules, but has refused to provide any evidence to support this claim.

But Fairfax Media has uncovered fresh details about Mr Robert's connection to the GMT Group, an IT service company he co-founded prior to his political career.