Although John wasn't in his mother's household on census nights in 1841 and 1851, he may have just had occasional overnight stays with his maternal grandparents. In 1841, the 2 households were both at Ballagawne (adjacent page in census) and in 1851, Kentraugh, where John's grandparents were living, is only a short walk from Ballagawne.

In case the 1832 will of Jonathan Dumbell turns out to be of the wrong person, there's an interesting-looking John Dumbell b circa 1800 Liverpool, surveyor/house owner, with a tenuous Manx connection.

1851
Lancashire, Everton 3c/4
17 Salisbury St

Name Age
Thomas Brideson 38
Sophia Brideson 29
John Dumbell 53

Thos+Sophia both b IOM
John Dumbell lodger (no marital status given) b LP

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He's also in the 1841 and 1861 censuses.

Jean C