PM Malcolm Turnbull posts video of humble childhood upbringing

Malcolm Turnbull has laid bare his humble childhood that he says was filled with so much love he never felt he missed out on anything, despite growing up with a single dad.

Overnight the prime minister posted the deeply personal tribute to his father Bruce, in a highly produced video message on Facebook.

The household didn't have much money, but hard work and sacrifice had allowed a young boy to go to school and achieve what his father couldn't, Mr Turnbull narrated.

"Big brother, little brother really was the type of relationship - we were incredibly close," Mr Turnbull said.

"I didn't feel I missed out on anything because I had lots of love."

The note of humility is expected to continue on Monday, when Mr Turnbull takes time out from the campaign hustings, along with Opposition Leader Bill Shorten, to address the Returned Services League centenary conference in Melbourne.

"The RSL honours our warriors, their families and cares for them, it has done the most remarkable service over 100 years," Mr Turnbull said, after a wreath-laying ceremony in Melbourne's Shrine of Remembrance on Sunday.

RSL national president Ken Doolan will outline the problems wounded and mentally scarred veterans have, accessing basic health care and support.

The RSL is urging both major parties to overhaul the veterans support system.

Later on Monday, Mr Turnbull will continue spruiking his innovation agenda at an event promoting women in science, technology, engineering and mathematics.

The 2012 Young Australian of the Year Marita Cheng will showcase her start-up's telepresence robot, which enables people to instantly beam from one place to another.

Mr Turnbull will announce applications open in July for the government's special women in STEM fund.