Sister-in-law

Definition and stakes

Roundell Palmer,  Marriage with a Deceased Wife's Sister… (1873)

“ Every married man whose wife has sisters has an interest in that condition of society which is produced by the state of law which makes his wife's sister his "sister-in-law." Our popular expression exactly hits the principle. The law makes the wife's sister his sister, and if you alter the law the wife's sister for domestic purpose will be his sister no longer. Do you want prohibitory laws against marriage without any degrees of relationship, or do you not? ”
Source: Wikisource

Jacob Jones Janeway,  Unlawful Marriage (1844)

“ A wife's sister is to her precisely the same, her near kinswoman: and, therefore, by parity of reason, her husband may not marry his sister-in-law; because he is expressly forbidden to marry his mother's sister, who sustains the same relation to his mother which his sister-in-law sustains to his wife. ”
Source: Wikisource

The German Classics of the Nineteenth and Twentieth Centuries…

“ It is a peculiar life that goes on in the house with the green window-shutters. The sister-in-law, still a beautiful woman, little younger than the master of the house, treats him with a kind of silent respect, or even veneration. And her sons do the same. The old gentleman shows his sister-in-law a respectful consideration, a sort of chivalry that has something touching in its grave reserve; toward his nephews he displays the fondness of a father. ”
Source: Gutenberg

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