Peter Clegg was the only son of Gordon and Caroline Clegg and the grandson of Betty Williams. He was born in 1985 and lived in London. In 1995 he attended his grandmother's wedding to Billy Williams along with his parents.
Apart from the wedding, Peter never visited Betty at any other time. When she passed away in 2012, Gordon attended the funeral alone - both Caroline and Peter were absent for unknown reasons.
- Peter was uncredited in his two appearances.