Joanne,
I have been searching for your ancesters on the IGI here is what I have found. I hope it proves to be correct, let me know if it is?
Henry KELLY born 20/4/1806 in Malew - parents Henry and Isabel nee KNEALE
Henry KELLY married Catherine [? CLAQUE] on 19/04/1838 at Malew.
Children:
1)Catherine christened 28/10/1838 at St. Mary's Church, Castletown.
2)Margaret christened 24/05/1840 at St. Mary's Church, Castletown.
3)Anne christened 26/01/1842 at St. Mary's Church, Castletown.
4)John christened 27/03/1844 at St. Mary's Church, Castletown.
5)Richard christened 05/07/1846 at St. Mary's Church, Castletown.
6)Henry christened 09/02/1848 at St. Mary's Church, Castletown.
7)William christened 30/06/1850 at St. Mary's Church, Castletown.
Lucy christened 07/07/1852 at St. Mary's Church, Castletown.
9)Isabella christened 18/10/1854 at St. Mary's Church, Castletown.
I looked for marriages of the children and here is what I have found:

Catherine married Joseph HANSON - not on IGI.

Margaret (2 possibles) either; Richard SHIMMIN on 25/11/1858 at Malew OR William DINWOODY on 09/05/1863 at Malew.

Anne (3 possibles) either; William CARINE on 10/12/1859 at Kirk Rushen OR Thomas HALSALL on 02/05/1863 at Rushen OR there was an Ann Elizabeth KELLY married to a John HOCTOR on 02/11/1870 at Malew.

John (2 possibles) either; Catherine CLARKE on 14/03/1863 at Malew OR Ann CLAQUE on 21/09/1865 at Malew.

Richard married Anne CUBBON on 29/08/1861 at Arbory. ( He would only have been 15yrs old, I looked right up to 1890 and this was only one I could find.)

Henry married Elizabeth COSTAIN on 24/02/1870 at Arbory.

William (too many to choose from)

Lucy married John CUBBON on 13/09/1873 at Malew.

Isabella married Edward CLARKE on 08/08/1872 at Malew.

These are hopefully correct, but do check them out first.
Hope they help you?
Kind Regards,
Carol.