Co MONAGHAN - William LITTLE, Isabella RIDDELL and family

I am an Australian descendant of Eliza LITTLE (abt 1837 - 1857) and her parents, William LITTLE (abt 1787 - 1854) and Isabella RIDDELL (abt 1797 - 1857) who immigrated to Melbourne, Australia in 1850 on the "Reliance".  I believe Eliza was about 11 years old on arrival. 

They came from Co Monaghan and I believe they were born in either Newbliss or Clones and William was a farmer.  Sadly both William and Isabella died within a few years of their arrival in the Colony but many of their children appear to have survived and prospered.

I would appreciate any information about their births, marriage and lives in Co Monaghan.  I have read that millions of Irish left their homeland between 1845 and 1852 due to the disastrous impact of the Great Irish Famine so I assume this is the reason why the Little Family left Ireland.