A., I don’t know about Kermode, but the Joughin side has been well covered in postings by Sue, myself and others in this long thread.
The main thing that points Isabella Joughin to her parents is the 1841 census, when she was living in Bridge Street, Peel. She is listed under Thomas (shoemaker) and Mary Joughin and their children, aged 16 to 2. Then comes Isabella, Aged 20. Under the rounding system used in 1841, an age of 20 could mean anything from 20 to 24, putting her date of birth between 1816 (censuses were taken early in the year) and 1821. The whole range lies before the January 1822 marriage of Thomas and Mary. In 1841 you have to presume the family relationships. If Isabella was a daughter of Thomas and Mary, it is odd that she was placed at the end of the list of children, rather than the beginning. She might have been the daughter of Thomas or Mary, but not the other. We cannot get a father’s name from her marriage record because such information was only recorded on the Isle of Man from half way through the next year, less than a year after the marriage. Thomas does not mention Isabella in his will, but then the only one of his children that he does mention is his son Thomas. I have not found a will for Mary. Thomas and Mary both had fathers called Philip Joughin, both baptised at Andreas only a few years apart, one from each of the two lines of Joughin in Andreas. If you read the various postings in the thread, you will see that this has been gone into.
Philip Allen