But when it comes to football, their rivalry is a long and chequered one.
Bets remain unpaid and sometimes confrontations ensue.
West Coast Eagles fan Mr Williams referred to Fremantle Dockers fan Mr Templeman as a “political mentor”.
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READ NOW“David Templeman is a great local member for the people of Mandurah, but when it comes to football his views are rubbish,” he said.
“He was quite vocal at the start of the season, but he got quiet as the season has gone on.”
The two men have an ongoing bet involving a bottle of spiced rum.
“It would be nice if he paid up for the last four derbies we won,” Mr Templeman said.
“I keep reminding him and saying things like I’m really thirsty.”
But the treacherous Mr Williams drank the last bottle of rum because the Eagles won the last derby.
“Every time the Dockers win Rhys can’t answer the phone or his broadband fails,” Mr Templeman said.
Mr Williams claimed Mr Templeman was a fair weather fan.
“I didn’t know David barracked for the Dockers until they started winning,” he said.