I replied to your email but it bounced back.
1841 Census Index
Onchan 4 5 20 adult ages were rounded in 1841
1851 Census Onchan
Surname Residence Status Age Occup Where Born
You have the wrong marriage date--it is 21 Oct 1838 Onchan
1861 Census Index
Onchan 2 73
Mary 48 b Onchan
Thomas 50 b Onchan
Thomas 9 b Onchan
Margaret 13 b Onchan
1871 Census Index
Thomas 19 b Onchan is living in Peel
Rest of the above aren't in census as far as I can tell.
Parents perhaps moved off the island or died?