Oh when another Riewoldt comes marching in! Saint Kilda captain Nick and his wife Catherine are expecting their second child

By SOPHIE GOULOPOULOS FOR DAILY MAIL AUSTRALIA

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Saint Kilda captain Nick Riewoldt, 33, and his wife Catherine are expecting their second child, due in December. 

Taking to Twitter on Monday, Catherine shared an adorable snap of the couple's firstborn James, 18 months, clutching a doll with a wide-mouthed smile to make the announcement.

In the caption, she wrote: 'Hard to tell whether James is REALLY excited or just angry about our exciting news #babyrootwo #boyorgirl?'

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Oh when another Riewoldt comes marching in! The couple announced that they were expecting back in June this year with a sweet post featuring their son James 

Oh when another Riewoldt comes marching in! Saint Kilda captain Nick and his wife Catherine are expecting their second child

The sporting family welcomed their first son James in December 2014, and married in Catherine's native Texas in 2012.

In February 2015 however, the family were struck by tragedy when Nick's younger sister Madeleine lost her five-year battle with a rare bone marrow condition aged just 26.

Catherine took to Instagram to share a loving tribute to her sister-in-law, thanking her for 'for teaching me every possible fact about the AFL and for giving my husband the inspiration to live his life to the fullest every day'.

Wedding bells: Nick and Catherine tied the knot in her native Texas in 2012 

Wedding bells: Nick and Catherine tied the knot in her native Texas in 2012 

Expanding the brood! The sporting family welcomed their first son James in December 2014

Expanding the brood! The sporting family welcomed their first son James in December 2014

In an interview with The Herald Sun at the time, Catherine said her life changed when she became a mother, but the joy of welcoming her first child was overshadowed by the family's loss.

'Maddie wished she could have been there [in the delivery room],' she said.

'It would have been great to have her in that room. That’s definitely one of the hardest things.'

The family later established a charitable foundation for their sister, calling it Maddie Riewoldt’s Vision.

'Maddie wished she could have been there [in the delivery room]': In an interview with The Herald Sun following her first son's birth, Catherine said the joy of welcoming her first child was overshadowed by the family's loss of Nick's sister Madeleine

'Maddie wished she could have been there [in the delivery room]': In an interview with The Herald Sun at the time, Catherine said the joy of welcoming her first child was overshadowed by the family's loss

It aims to raise funds to #fightlikemaddie and find new treatments for bone marrow failure, and opportunity to donate even comes in the form of special purple Converse sneakers.  

The relentless forward-turned-midfielder has just signed on for his 17th season with the Saints, having played his 300th game earlier this year.

Despite battling a long-term knee injury, the veteran footballer told the AFL recently: 'It's probably been the best I've felt for four or five years to be honest'. 

Tragic: In February 2015, the family were struck by tragedy when Nick's younger sister Madeleine lost her five-year battle with a rare bone marrow condition aged just 26 (pictured right with Kangaroos star Nick Dal Santo, middle)

Tragic: In February 2015 however, the family were struck by tragedy when Nick's younger sister Madeleine lost her five-year battle with a rare bone marrow condition aged just 26 (pictured right with Kangaroos star Nick Dal Santo, middle)

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