411 REFERENCE · Wiktionary
Scotch sister
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Noun
en obsolete A distant relation; possibly a cousin.
en Elizabeth Gaskell 19 Wives and Daughters London Smith, Elder & Co. 1866 [S]he had heard of the probability of her having a sister—(she called her a sister, but whether it was a Scotch sister, or a sister à la mode de Brétagne, would have puzzled most people)[.]
See also
Parenté à la mode de Bretagne fr