I have a bit more to add. The daughter "Cathe" bp 1810 I think will be the Catharine FELL who married Flaxney STOWELL 27 Nov 1832 in Malew. There are no children. They are in all the census's at Malew, and have her younger brother William an unmarried Baker with them. Catherine was buried 1 Nov 1898 and Flaxney 27 Apr 1908 (age "95 + 11 months") and William Fell 8 Dec 1906.
William is in the IGI as "William FAYLE son of Paul FAYLE and Elr STEPHEN" bp 10 Sep 1820 Marown. I didn't find him until today, but he must be the last (12th?) child of Paul FELL and Isabella STEVENSON. This couple had children across a 28 year spread, starting in Braddan 1792, then St George Douglas 1797-1810, then Braddan 1815-17, then Marown 1820. Jane has to fit between 1810 and 1815. They seem to be in Malew by 1824, which is the year their son Nelson was buried.
These are the children I've found of Paul FAYLE/FELL who married Isabella STEVENSON 12 Nov 1791 Braddan:
1. Paul William 1 Apr 1792 Braddan. He may be the 58 year old Blacksmith b IOM lodging at Liverpool in 1851 with presumably his wife Jane Fell age 42 .
2. Robert bp 15 Oct 1797 St George Douglas. IGI says "Robert FELL son of Robert FELL & Isabella STEPHEN". If he belongs, then he must have died but no burial in index.
3. Nelson bp 23 Mar 1800 St George. A "Nelson FALE" was buried in Malew 13 Sep 1824.
4. Robert bp 23 Mar 1800 St George, perhaps a twin to Nelson? He married Jane KEWLEY 22 Jun 1831 Kirk Rushen and I found 8 children all born Castletown or Malew. One of them, Catharine age 16, is visiting the Godsoe family in 1851 at Toxteth Pk. He was buried 7 Mar 1882 Malew. He was an Ag Lab.
5. Isabella bp 28 Nov 1802 St. George. Nothing more found. May have died early. There are 3-4 potential burials.
6. John bp 6 Nov 1804 St. George. Dead by 1817, with several potential burials.
7. Sarah bp 14 Jun 1807 St. George. Nothing more found.
8. Cathe bp 7 Jan 1810 St. George. Discussed above.
9. Jane born ca 1812-13. Lynne's ancestor.
10. Christian bp 22 Feb 1815 Braddan. Nothing more found.
11. John bp 22 Jun 1817 Braddan. Haven't researched.
12. William bp 10 Sep 1820 Marown. A baker, he lived with his sister and brother in law Catherine & Flaxney Stowell and did not marry. Bd 8 Dec 1906 age 86 ( burial index says "89").