Poor Mary [Austin] will do her very best and sisterliest for you. A kinder soul is not in the Earth.1864 July 14, Thomas Carlyle, “1853–1856. Illness and Death of Carlyle’s Mother. Suffolk. Kinloch Luichart”, in Trudy Bliss, editor, Thomas Carlyle: Letters to His Wife, Cambridge, Mass.: Harvard University Press, published 1953, →OCLC, page 368:
Burton designed both Middleton sisters' dresses in white, so that when Pippa picked up Kate's train in the abbey, the two of them were united, visually, in a display of sisterly togetherness.2011 May 4, Jane Martinson, The Guardian:
In the manner of a sister, behaving as one would expect of a sister; as a sister, as sisters.
"What honest man, who is not insane, would take lost women and thieves into his house to dwell with him sisterly and brotherly?"1908 February 19, Jack London, The Iron Heel, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., →OCLC: