His family moved to Australia and he was brought up in Sydney where he started playing rugby league with the Coogee Randwick Wombats club at the age of 10.

[2] He played high school rugby for St. Joseph's College, Hunters Hill located on Sydney's Lower North Shore.

[3] He became friends with St. Joseph's teammate Kurtley Beale and for two years the pair backed up with Kensington in the South Sydney junior rugby league competition.

[4] Having attended a public primary school, Peter represented Sydney East PSSA at the State Championships in 2001 at Kiama.

[20] On 11 March 2021, Betham would leave Clermont to sign for Pro D2 side Provence ahead of the 2021-22 season.