100 Anime Brother and Sister Relationships in Anime (Not Adoptive, Step-Siblings, In-Laws, Cousins)

In anime, brothers and sisters are a common theme, whether they are separated by years or are twins
Adoptive siblings are individuals who become siblings through the legal process of adoption. Example Edward and Alphonse who become adoptive siblings to Winry Rockbell after their parents' deaths from Fullmetal Alchemist
Step-siblings are children who become siblings as a result of their respective parents marrying each other. Example Yume and Mizuto Irido from Mamahaha no Tsurego ga Motokano datta
In-laws are relatives by marriage. This includes the siblings of one's spouse (brothers-in-law and sisters-in-law) and the spouses of one's siblings. Example After Naruto marries Hinata, he becomes the son-in-law of Hiashi Hyuga, Hinata's father. Additionally, Hanabi Hyuga becomes Naruto's sister-in-law.
Cousins are the children of one's aunt or uncle. They share a common set of grandparents but have different parents. Example Hinata and Neji Hyuga from Naruto
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