Lizzie Borden (1860–1927) allegedly killed her father and her stepmother with an axe in Fall River, Massachusetts, in 1892. She was acquitted, but her innocence is still disputed. Iyasus I of Ethiopia (1654–1706), one of the great warrior emperors of Ethiopia, was deposed by his son Tekle Haymanot in 1706 and subsequently assassinated.In more contemporary history there have also been instances of father–offspring conflicts, such as:

Chiyo Aizawa murdered her own father who had been raping her for fifteen years, on October 5, 1968, in Japan. The incident changed the Criminal Code of Japan regarding patricide. Kip Kinkel (1982- ), an Oregon boy who was convicted of killing his parents at home and two fellow students at school on May 20, 1998. Sarah Marie Johnson (1987- ), an Idaho girl who was convicted of killing both parents on the morning of September 2, 2003. Dipendra of Nepal (1971–2001) reportedly massacred much of his family at a royal dinner on June 1, 2001, including his father King Birendra, mother, brother, and sister. Christopher Porco (1983- ), was convicted on August 10, 2006, of the murder of his father and attempted murder of his mother with an axe. Terminology
Biological fathers
Baby Daddy – A biological father who bears financial responsibility for a child, but with whom the mother has little or no contact. Birth father – the biological father of a child who, due to adoption or parental separation, does not raise the child or cannot take care of one.
Dolphin fathers help in the care of the young. Newborns are held on the surface of the water by both parents until they are ready to swim on their own. A number of bird species have active, caring fathers who assist the mothers, such as the waterfowls mentioned above. Apart from humans, fathers in few primate species care for their young. Those that do are tamarins and marmosets. Particularly strong care is also shown by siamangs where fathers carry infants after their second year. In titi and owl monkeys fathers carry their infants 90% of the time with "titi monkey infants developing a preference for their fathers over their mothers". Silverback gorillas have less role in the families but most of them serve as an extra protecting the families from harm and sometimes approaching enemies to distract them so that his family can escape unnoticed.Many species, though, display little or no paternal role in caring for offspring. The male leaves the female soon after mating and long before any offspring are born. It is the females who must do all the work of caring for the young. A male bear leaves the female shortly after mating and will kill and sometimes eat any bear cub he comes across, even if the cub is his. Bear mothers spend much of their cubs early life protecting them from males. (Many artistic works, such as advertisements and cartoons, depict kindly "papa bears" when this is the exact opposite of reality.)