'Being married to you most successful moment of my life'

Hundreds of mourners have gathered in Sydney to farewell Sharnie Kimmorley, wife of NRL great Brett, after she died of brain cancer.

Sharnie, a devoted mother of four young girls — Maddi, Mia, Ava and Ivy — passed away at home last week at the age of 38 following an eight-month battle with the disease.

Speaking on behalf of Brett, older brother Craig paid an emotional tribute to Sharnie.

"Sharnie was the best, most natural mother in the world. She loved being a mother and a big family is what she always wanted," Brett wrote.

"Sharnie's ability to put others first didn't go unnoticed. This is a value she has instilled in our family. Packing the car full to the brim at the age of 19, Sharnie moved to Melbourne to support me. We created coffee clubs for two.

"Being married to Sharnie was the most successful moment of my life."

Maddi Kimmorley also paid tribute to her 'best friend': "There are no words to explain how much mum meant to me. She wasn't just a mum, but a friend, a coach and someone so caring that would do anything just to make us kids happy."

Ava described her mum as 'the best in the whole world': "She would always put others before herself, especially our family. She was the most kind and loving person."

Youngest daughter Ivy also paid a loving tribute: "Mum cooks the best dinners. I love the spaghetti bowl the most. I love when mum wears her green and yellow dress that dad bought her for her birthday. She looks beautiful in it."

Some of the biggest names in rugby league were in attendance on Thursday afternoon, including NRL CEO Todd Greenberg and premiership winner Michael Ennis.

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His former Melbourne Storm teammates Robbie Kearns, Tony Martin, Anthony Quinn, Ben Anderson and Matt Geyer were all be at Woronora Cemetery for the service, as well as former coach Chris Anderson.

"The game has the ability to wrap its arms around Brett and his daughters and support them not just today or tomorrow but for a long period ahead," Greenberg said.

"Brett knows that. He knows the game has its arms around to help as best we can."