I did Scarff[e] research a few years ago. Unfortunately I have no information on the Thomas bp 26 Dec 1794 Lonan s/o Thomas Scarff & Eleanor Kewley, nor his brother John 9 Feb 1800.

Thomas Scarff md Eleanor Kewley 16 Jun 1787 Lonan . He was buried 8 Feb 1839 age 76, and she was buried 2 Apr 1853 age 93. Thomas was the s/o Philip Scarff & Ann Callister md 30 Jul 1755.

Children, all baptized Lonan: (interesting that the first 3 all married a Moore.)
1. Margaret 10 Jul 1788, md John Moore 15 Jan 1815, issue.
2. Jane 9 May 1790, bd 10 Feb 1880, md Thomas Moore 3 Aug 1811, issue.
3. Anne 20 May 1792, md Edward Moore 22 Jul 1820, issue.
4. Thomas bp 26 Dec 1794.
5. William bp 29 Jan 1797, bd 3 Feb 1881 Braddan, md Ann Mylrea 14 Aug 1824, issue.
6. John bp 9 Feb 1800.
7. James bp 23 Jan 1803, bd 7 Dec 1887 Braddan, md Margaret Lewin 29 May 1830 Braddan, issue.
8. Isabella bp 25 Nov 1804, died in West Derby and bd 30 May 1875 Lonan, spinster.

Re:the Thomas buried 16 Dec 1829 Lonan, the Lonan burial register has a pair of burials:
1829 Ann Scarff wife of Thos Scarff buried 16 Dec
1829 Thos Scarff his son 16 Dec.
This looks like a childbirth death. Thomas Scarff md Ann Moore 16 Jan 1808 Braddan, 8 children up to 1827 none named Thomas.