DEAR AMY: My father is serving a long term in prison for a violent crime he committed many years ago. He was hardly the model citizen or dad of the year before his incarceration. I was a teenager when he was convicted and the whole thing consumed a lot of my childhood, but after he was gone, I hate to admit that my life improved a lot. Although I think about him from time to time, I don’t miss him. Aside from two visits early on, I have not seen him or been in touch. Honestly, I don’t miss him. I have a great husband and we have a 5-year-old son. So this is my son’s grandfather. My son has onl…