Waterhouse doesn't need mum's help: Greens AUSTRALIAN Greens senator Richard Di Natale says his mother will leave it up to him to fight his own battles - unlike Gai Waterhouse who has rushed to defend her son's online betting company. Ms Waterhouse, a champion horse racing trainer, defended her bookmaker son Tom in News Limited Sunday papers, saying politicians should stop criticising him. Senator Di Natale says his mum will not be going in to bat for him. "I was chatting to mum over Easter lunch and mum says that she thinks Tom and myself are big enough to fight our own battles and we should do that," he told reporters in Melbourne on Tuesday. Senator Di Natale said the parliamentary committee into gambling had written to Mr Waterhouse and hopes he will appear without being compelled to. It would be hard for a child watching sport to determine when the advertising ends and the sport begins, he said. "It's not really a question of Tom Waterhouse - it is a question of the proliferation of sports betting in advertising that we get now through our major codes," he said. Senator Di Natale hopes for cross-party support for a Greens bill to outlaw live odds during sports events and sports-related shows such as The Footy Show. The Greens have released an exposure draft of a private bill they plan to introduce to parliament that would ban the broadcast of betting odds during sports and related broadcast programs such as The Footy Show. "It's becoming increasingly hard for young kids to know where the sport ends and the gambling begins," Senator Di Natale said.