Answer
Dalton McGuinty first won his father's former seat in 1990. His father, Dalton McGuinty Sr., had held the seat for 20 years before retiring in 1985. McGuinty Jr. ran for the seat in the 1990 provincial election and won, becoming the Member of Provincial Parliament (MPP) for Ottawa South. He held the seat until 2013, when he retired from politics.