The family you mention is known:
Dorothy KERRUISH is of the Ballafayle, Maughold family which has famous descendants still on the Isle.

This family should be listed on my database at:
http://www.my-ged.com/callow

The IGI has some of them listed as KERRNISH:

KERRNISH (sic) Christian d/o Robt KERRNISH & Isab CHRISTIAN chr 10 Feb 1862, Maughold, IOM

KERRNISH Dorothy Mary d/o Robt KERRNISH & Isab CHRISTIAN chr 07 Apr 1860, Maughold, IOM

KERRNISH Eliza Jane d/o Robert KERRNISH & Isabella CHRISTIAN chr 11 May 1864, Maughold, IOM

KERRNISH Ellen Elizabeth d/o Robert KERRNISH & Isabella CHRISTIAN chr 28 Aug 1870, Maughold, IOM

KERRNISH Henry Howard s/o Robert KERRNISH & Isabella chr 21 Apr 1872, Maughold, IOM

KERRNISH John Thos s/o Robert KERRNISH & Isabella CHRISTIAN chr18 Oct 1865, Maughold, IOM

My research has Dorothy married to a William CHRISTIAN....maybe she married twice ?

Robert KERRUISH & Isabella CHRISTIAN (Balldromma, Maughold) had at least 11 children & Robert had two children to his first marriage to Mary STOWELL