As Deep Space Nine continued over the course of seven seasons, Sisko and Jake's relationship took on new dimensions. Jake grows into an empathetic young man who inherits his father's interests in the arts and becomes a writer. Sisko evolved into one of the most complex characters in all of science fiction. He was a wounded widow and, eventually, beloved husband to his second wife, Kasidy (Penny Johnson), a righteously determined Starfleet captain, and a man aware that for this war to be won, he would have to sacrifice his own morality for the sake of progress. Brooks gave Sisko his trademark bombastic intensity and gravitas. He made his monologues feel theatrical while never sacrificing the core of their emotional impact. But there was also something about the quieter moments, where his face would melt into a broad smile whenever he saw a child or held Jake in his arms. Sisko's love for Jake provided a poignant contrast to the temerity and flinty brio he portrayed as a captain. Ira Steven Behr, who took over as showrunner in 1995, and the inventive writing staff, which included creators like Ronald D. Moore, never lost sight of the fact that the heart of Sisko's character would always be his love for Jake.
http://www.vulture.com/2018/01/deep-space-nine-revolutionary-depiction-of-black-fatherhood.html
Still my favorite ST show. I need to rewatch it.