In early series Frank comes across as a drunken bully, even headbutting his son Ian on one occasion. Most of his children initially hate Frank for his drunken bullying ways. Lip and Ian are never scared to show their feelings towards him, and even physically attack him on a few occasions. However, his middle daughter Debbie shows sympathy throughout the series when her father is either in serious trouble or presumed dead, something which has happened three times to date. The family have generally warmed towards him more as the series has progressed, mostly because he isn't bothering them hugely on a daily basis. However, Debbie finally grew sick of taking care of the family, and cleaning up after Frank in particular, and left to join the army after series 6. Frank and Liam came into serious conflict in series 7, when Liam was forced by circumstances to take over Debbie's former burden as the de facto head of the family. At one point, Frank headbutted Liam, and a furious Carl had to be restrained from beating Frank to a pulp. Frank finally softened towards Liam when Liam threatened to commit suicide.