according to Bishop's transcripts Thomas Quine m Alice Quine als Cottier lon 1764-07-18
is this yours

There are at least 2 Lonan families headed by a Thomas Cowin post this date and as yet I have not yet determined which child belongs to which parent

Searching for Ballacowin in Manx Note book finds re Thomas
"At Ballacowin, in the Douglas circuit, January 6th, 1848, Mr. Thomas Cowin, aged seventy years. He lost both his parents in one week, when he was only sixteen years of age."
does this help ?