Frank's alcoholism intensified after his first wife Monica left him for Norma Starkey (Dystin Johnson). He then left the younger children in the care of Fiona, and moved in with agoraphobic Sheila. Often known to make a fool out of himself and shirk all responsibility, Frank nonetheless shows signs of loving his children. He can offer good advice, for example saving Liam from being taken into care when a parent was needed. When he is rendered completely sober by a new drug, Frank appears reflective and even quite intelligent, wondering why Sheila would add to her problems by marrying a mess like him. We also understand his character a bit better when Frank's father pays a visit and treats his son in a condescending and abrasive manner. Frank's father shows extreme sympathy towards Sheila and even takes care of the twins. It is also stated that his father did not always treat Frank kindly when Frank was growing up.