There is a marriage Braddan 17481112 of John Skillicorn and Mary Kelley (noted as of Lonan) - is this your margt ? - no obvious burial or will for a mary, I didn't check the mary against the actual reg but against the 1911 copy - it is possible that it was margt mistranscribed in 1911 as mary. There is a 'child' bapt to John Skillicorn of Laxey in Lonan reg (I checked the original) in 1749 - john skillicorns are actually not that common in Lonan at this time - the only philip bapt to a john is in 1757 which fits with later child