David: Perhaps I've misunderstood your question, however, I find on Brian's Birth and Marriage Indexes the following entries:

Under Marriages:
WALES, William/16 Jul 1885/D/bra/89a/MC GRAVEY, Catherine

Under Births:
WALES, Catherine/25 Nov 1885/Douglas/553/WALES, William/MC GREAVEY, Catherine
and -
WALES, Robert William/6 Dec 1887/Douglas/677/WALES, William/MC GREAVY, Catherine

All plainly showing that Catherine McGreavey/McGravey and William Wales were married in 1885 and were the parents of 2 children - Catherine and Robert William.