the 1851c indicates Isabella Mylrea as mother (age 58)(married rather than widowed but no fa present) - however the only Wm Mylrea born around this time is indicated (igi) as son of thomas + margt cowin (married Braddan 1809) - but no other children listed - in 1841c there is indeed a 14 yr Wm living with a suitably aged Thomas + Margt at Ballaoates Braddan but with two other ?children - there is a Thomas Mylrea known as an early Wesleyan Local Preacher (please note lay preachers are NOT ministers - see Manxnotebook) who was noted as active by Rosser in 1833 as son of an early convert.
Thus something is strange re names