how sure is the 1821 ? - Wm Duke + a jane cain were servants at Ballamoar (Braddan dist 1 page 10) in 1841c - jane is age 25 which would fit well with jane d/o Thomas Cain + marjery/mappy cain bapt Marown 18160110 (I havn't found marriage tho) - the parents and 2 youngest ch are in 1841c at Braddan dist 3 page 15