Worst ones are the obvious subjective answers such as: Yondaime Kazekage, Hiashi Hyuga, and Butsuma Senju etc.
Besides the clear obvious ones, I think Fugaku Uchiha was a terrible father. He put his son, Itachi, through hell for his own selfish gain and he knew his son had to choose between his family or world peace, he was a true scumbag. And he ultimately gave Sasuke his inferiority complex to Itachi, he constantly competed with him because his father didn't give enough ****s to tell his son he loved him or anything, and eventually this went on to Sasuke constantly envying Naruto. **** Fugaku.
And the best one... Father figure, right? Asuma is definitely up there, he molded Shikamaru into an apparent Hokage candidate from a lazy slacker, not bad. I'm not going to say Minato due to the fact he deliberately sacrificed his son for his village [good leader, bad father]. I will go with Might Dai. He inspired his son more than anyone and, to me, Gai is the most positive and heroic character on the battlefield right now.