Jenny, in FamilySearch on the IGI [NOT "All Resources" or any of the other options] put Father: Patrick Crellin, Mother: Elizabeth Tear, and Batch Number: C038271 [for Ramsey parish register transcripts], with Birth/Christening, but leaving the space for the children blank, you should see the list of the five children bapt in Ramsey, with one entered twice because someone has misread the date Jan/Feb.
Then do the same search with Batch Number: C038041 [for St Matthews, Douglas parish regs] and you will find the first two children.

You can do the same search without the batch numbers, but you will see a lot of lower case entries which have been submitted by Church members and may or may not be correct transcripts. Unfortunately some of these now replace the original parish register transcripts, but apparently not in this case.

I'll write to your email address about the Corteen files.

Sue