Dennis Devlin took pride in his many roles in life from New York City firefighter to father to husband to friend. But he took the most pride in his sons, Casey and Dennis Jr., and daughters, Kerry and Katie, who sang "Amazing Grace" at their father's memorial service last month. He watched his children compete in sports, excel in school, grow up and gave them a daily-and-healthy dose of cod liver oil each morning after a hot bowl of oatmeal, friends recall. He was a devoted husband to Kathleen Ann O'Keefe Devlin for more than 30 years. He was 51.