Despite that estrangement , Cathy feels the need to see him before she dies .
Brian Cox ( Season 1 ) and Brian Dennehy ( Season 4 ) as Donald Tolkey , Cathy and Sean 's father , with who they both have an estranged relationship .
Despite that estrangement , Cathy feels the need to see Sean before Cathy dies .
Brian Cox ( Season 1 ) and Brian Dennehy ( Season 4 ) as Donald Tolkey , Cathy and Sean 's father , with who they both have an estranged relationship .