Hello Chris,
I see that the IGI has the following children born to 'your' couple...
GEORGE DIVORTY Birth: 03 NOV 1854 Ch: 01 JAN 1855 Inverurie, Aberdeen, Scotland 
 GEORGE DIVORTY Male Birth: 23 NOV 1852  : 16 DEC 1852 Keithhall And Kinkell, Aberdeen, Scotland 
 ROBERT DIVORTY Birth: 24 DEC 1850 Ch: 16 JAN 1851 Keithhall And Kinkell, Aberdeen, Scotland  
 WILLIAM DIVORTY Birth: 04 MAR 1849 Ch: 29 MAR 1849 Keithhall And Kinkell, Aberdeen, Scotland 
Copies of these records are available for download from the ppv site at 
www.scotlandspeople.gov.uk.  On the same site I note on the free search, a will and I'd imagine an inventory for  a William Divorty who dies circa 1870.  When did he die?
Regards,   Steve