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? ”
