Anna watts would appear to be d/o James Watt(s) + Mary Corrin (named after a sister who had died earier that year)
Mary Corrin is noted as irish in 51 c + but dies age 49 from smallpox bur Patrick 18590523
James would fit to be s/o David Watt and jane Qualtrough - m Rushen 18081020 when both of parish;
is in both 41 (age 70 ag lab Port Erin) + in 51 census David a widower is age 80 (a beggar (ag lab) + noted as blind Port Erin born Ireland living with unmarried dau Ann + gson(?illeg) Henry Watterson in 51