While Quinn Fry joined the cast in the sixth episode. Knickerbocker and Fry left the main cast after the third season.
Gretchen Rossi was introduced in the fourth season premiere on November 25, 2008.
Giving a ITV's Lorraine an honest interview, he said: 'She literally did bring the family together.'I've got eight children and I think I am appreciating it more now in old age than I ever did before.
I really cherish those moments.' Candid: Rod said: 'My brothers and sisters were initially suspicious and worried about a repetition of my relationship with Rachel Hunter, who’d recently left me after eight years of marriage'.
The 46-year-old model beamed as she sang hymns with her rocker husband and retired lawyer father - who are both 72 - during the heartwarming outing.