I will respond to this
you gave me the same tree though I recall you had Darling(Dollin) which I interpreted as the record had Darling which you equated to Dollin - Dollin is an extremely unusual name post 1750.
I have asked many times re the bible - eg the age thereof - the hand used to enter the info etc.
The two books, which I conveyed to the Manx Museum as requested, though they turned down the offer, had no information I could see about your specific family except for the 'massacre' which seemed to be poorly documented in other records - made no mention whatsover of any Manx roots - they are still in Peel to be passed on, as you requested, to who accepts your offer of paid research.
I have made no comment whatsover as to the American research and I have no problems with your Patk + Alice etc being buried there merely the connection you claim back to the Island where I can show that the two Patricks inherited land and were buried.
On a side note I was suprised to see how many Cains there were in the USA 1880 census in the southern states - many were exslaves and named I suspect from the biblical 'mark of cain' though a number were white but none of the few I looked at indicated any typical manx names (maybe those more expert in US genealogy could comment here) - no Will I have seen and I've now personally looked at over 60% of the 20,000 18C wills makes mention of Manx in this part of America (though many young seamen died in West Indies) - the early manx pre Ohio of 1820's were to the East Coast.

The IGI with patron submitted entries (especially Corlets) is indeed unreliable (do you need chapter + verse on this as I have been transcribing Ballaugh registers and comparing) - I have checked against the actual parish regs + the 1911 official copy for many entries in my readings, the land records are the original deeds (a few but not in your case) are very fragile, the wills are mostly from microfilm though I have requested sight of a couple of originals - again no real problems in reading 18th C wills (more tricky for 17th C as the film is much poorer and the material more fragile.

Now to return to the Steen marriage - as I have said there were two Adam Caines active in ame period - one in Knockan Ballaugh, the other in Orrysdale in Michael on border with Ballaugh - both had first sons Patrick who inherited the land (all this is in the land records available on Mormon film - the actual deeds detailing the transfers are at the manx museum - I had been researching Michael and initially thought that the twin Patrick in Ballaugh was the Patrick I knew had lived and inherited the Orrysdale farm (that Patrick was I think born whilst the Michael regs were not kept very well as Rev Henry Norris had a midlife crisis involving an illegitimate child) - the will of the Patrick in ballaugh (the twin whose date you quote) is noted as - art agr dated 10 Apr 1776 between wm kelly balaugh, wm bridson c'town wife alice als cain re goods due after decease of patrick cain (fa-in-law wm bridson + mo-in-law elinor) who d 24 Feb last past;annexed agr dated 13 Aug 1785 Wm Bridson acquits Wm Kelly of any sum etc due by death of mother-i-law Elinor Caine

As I pointed out the Cain/Corlet will relates to a different family