The only other detail in the Tithes is the amount of acreage Malachy was leasing.The people at that time didn't own their own land, they leased from a Landlord. I would say that this Malachy Quigly/Quigley is definately yours as their was no other Malachy Quigley recorded in Co.Clare at that time. I would also say that Thomas is his son and inherited the lease.
If you go to the Clare Library website and print off the residents of Knockanoura townland in the Tithes and then print off the residents of the Griffith's and compare both you will see a pattern emerge where the family names remain the same but the first names change. We will also probably see that some family names dissappear which would indicate they were wiped out in the famine
Go to the following link and you can get more detail for Thomas Quigley in the Griffith's Land Valuation. you will see that he was leasing 10 acres of Land which was a lot since a lot of families only had one acre.http://www.askaboutireland.ie/griffith-valuation/index.xml?a...
The key to your research is the Parish Records dated from 1816.
Good luck with your research