Unfortunately there appeared to be several William Moores in Maughold and Ramsey, so wills would probably be your best source to be certain you have the right marriages for the siblings. When a sibling died leaving young children the uncles and aunts could be named as supervisors.

Tom Corteen's Maughold marriage register transcripts consistently note "dec" for fathers from 1877 onwards, but none found by me before that date. The original registers might have them - you could order the film through LDS centres to double-check. If "dec." not recorded William Moore farmer of Lewaigue would be a good bet to have been the father.

Sue