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What is Stepmother and explain in detail?
A stepmother, stepmum or stepmom is a non-biological female parent married to ones preexisting parent.
A stepmother-in-law is a stepmother of ones spouse. Children from her spouses previous unions are known as her stepchildren.

Culture
Stepparents (mainly stepmothers) may also face some societal challenges due to the stigma surrounding the "evil stepmother" character. Morello notes that the introduction of the "evil stepmother" character in the past is problematic to stepparents today, as it has created a stigma towards stepmothers. The presence of this stigma can have a negative impact on stepmothers self-esteem.

Fiction
In fiction, stepmothers are often portrayed as being wicked and evil. The character of the wicked stepmother features heavily in fairy tales; the most famous examples are Cinderella, Snow White and Hansel and Gretel. Stepdaughters are her most common victim, and then stepdaughter/stepson pairs, but stepsons also are victims as in The Juniper Tree—sometimes, as in East of the Sun and West of the Moon, because he refused to marry his stepsister as she wished, or, indeed, they may make their stepdaughters-in-law their victims, as in The Boys with the Golden Stars. In some fairy tales, such as Giambattista Basiles La Gatta Cennerentola or the Danish Green Knight, the stepmother wins the marriage by ingratiating herself with the stepdaughter, and once she obtains it, becomes cruel.In some fairy tales, the stepdaughters escape by marrying does not free her from her stepmother. After the birth of the stepdaughters first child, the stepmother may attempt to murder the new mother and replace her with her own daughter—thus making her the stepmother to the next generation. Such a replacement occurs in The Wonderful Birch, Brother and Sister, and The Three Little Men in the Wood; only by foiling the stepmothers plot (and usually executing her), is the story brought to a happy ending. In the Korean Folktale Janghwa Hongryeon jeon, the stepmother kills her own stepdaughters.

In many stories with evil stepmothers, the hostility between the stepmother and the stepchild is underscored by having the child succeed through aid from the dead mother. This motif occurs from Norse mythology, where Svipdagr rouses his mother Gróa from the grave so as to learn from her how to accomplish a task his stepmother set, to fairy tales such as the Brothers Grimm version of Cinderella, where Aschenputtel receives her clothing from a tree growing on her mothers grave, the Russian Vasilissa the Beautiful, where Vasilissa is aided by a doll her mother gave, and her mothers blessing, and the Malay Bawang Putih Bawang Merah, where the heroines mother comes back as fish to protect her.

The notion of the word stepmother being descriptive of an intrinsically unkind parent is suggested by peculiar wording in John Gambles "An Irish Wake" (1826). He writes of a woman soon to die, who instructs her successor to "be kind to my children." Gamble writes that the injunction was forgotten and that she "proved a very step-mother."
Fairy tales can have variants where one tale has an evil mother and the other an evil stepmother: in The Six Swans by the Brothers Grimm and also in The Wild Swans by Hans Christian Andersen, the heroine is persecuted by her husbands mother and in another one by her stepmother, and in The Twelve Wild Ducks, by his stepmother. Sometimes this appears to be a deliberate switch: The Brothers Grimm, having put in their first editions versions of Snow White and Hansel and Gretel where the villain was the biological mother, altered it to a stepmother in later editions, perhaps to mitigate the storys violence. Another reason for the change from a villainous mother to a villainous stepmother may have been the belief that mothers were sacred, as well as the belief that people would not believe that a mother could harbor such ill-will and animosity toward their child. The Icelandic fairy tale The Horse Gullfaxi and the Sword Gunnfoder features a good stepmother, who indeed aids the prince like a fairy godmother, but this figure is very rare in fairy tales.
The stepmother may be identified with other evils the characters meet. For instance, both the stepmother and the witch in Hansel and Gretel are deeply concerned with food, the stepmother to avoid hunger, the witch with her house built of food and her desire to eat the children, and when the children kill the witch and return home, their stepmother has mysteriously died.This hostility from the stepmother and tenderness from the true mother has been interpreted in varying ways. A psychological interpretation, by Bruno Bettelheim, describes it as "splitting" the actual mother in an ideal mother and a false mother that contains what the child dislikes in the actual mother. However, historically, many women died in childbirth, their husbands remarried, and the new stepmothers competed with the children of the first marriage for resources; the tales can be interpreted as factual conflicts from history. In some fairy tales, such as The Juniper Tree, the stepmothers hostility is overtly the desire to secure the inheritance of her children.Stepmothers also make many appearances in Chinese tales of family. Wicked stepmothers are common. In Classic of Filial Piety, Guo Jujing told the story of Min Ziqian, who had lost his mother at a young age. His stepmother had two more sons and saw to it that they were warmly dressed in winter but neglected her stepson. When her husband discovered this, he decided to divorce her. His son interceded, on the ground that she neglected only him, but when they had no mother, all three sons would be neglected. His father relented, and the stepmother henceforth took care of all three children. For this, he was held up as a model of filial piety.
Conversely, the exemplary stepmother prefers the stepson to her own child, in recognition that his seniority makes him superior. The "righteous stepmother of Qi", faced with her son and stepson having been found by a murdered man, and both having confessed to shield the other, argues for her sons execution because her husband had ordered her to look after her stepson, and her son is the junior brother; the king pardoned them both for her devotion to duty.The ubiquity of the wicked stepmother has made it a frequent theme of revisionist fairy tale fantasy. This can range from Tanith Lees Red as Blood, where the stepmother queen is desperately trying to protect the land from her evil stepdaughters magic, to Diana Wynne Joness Howls Moving Castle, where, although it is known that stepmothers are evil, the actual stepmother is guilty of nothing more than some carelessness, to Erma Bombecks retelling where Cinderella is lazy and a liar. More subtly, Piers Anthony depicted the Princess Threnody as being cursed by her stepmother in Crewel Lye: A Caustic Yarn: if she ever entered Castle Roogna, it would fall down. But Threnody explains that her presence at the castle caused her father to dote on her and neglect his duties to the destruction of the kingdom; her stepmother had merely made her destructive potential literal, and forced her to confront what she was doing.The character of the evil stepmother can also be found in the genre of young adult fiction or young adult social problem novels. In Lisa Heathfields Paper Butterflies. the protagonist June suffers horrific abuse at the hands of her stepmother, a fact that she conceals from her father.
Despite many examples of evil or cruel stepmothers, loving stepmothers also exist in fiction. In Kevin and Kell, Kell is portrayed as loving her stepdaughter Lindesfarne, whom her husband Kevin had adopted during his previous marriage. Likewise, Lindesfarne considers Kell her mother, and has a considerably more favorable view of her than Angelique, Kevins ex-wife and her adoptive mother, due to feeling neglected by Angelique during her childhood. The Disney film Enchanted also makes references to the "evil stepmother" belief, as the villainess is a stepmother, but her wickedness comes from her selfishness and power hungriness rather than the simple fact she is a stepmother. When a little girl tells the heroine Giselle that all stepmothers are evil, Giselle reminds her that she personally knows some wonderful women who were good stepmothers, and the fact a woman is a stepmother does not suddenly change her personality