Checked some more birthplaces:

John Corris - Peel
Lavinia - Douglas
eldest daughter Druscilla (1899) Douglas
Leonard (1905) Douglas

Brian Lawson indexes have the following births:

CORRIS, Drusilla May 24 Oct 1898 Douglas 1398 CORRIS, John Kelly ACHESON, Lavinia Louisa
CORRIS, Eleanor Alice 17 May 1900 Douglas 1510 CORRIS, John Kelly ACHESON, Lavinia Louisa
CORRIS, Elizabeth Maud 16 May 1900 Douglas 1509 CORRIS, John Kelly ACHESON, Lavinia Louisa

And the parents' marriage:

CORRIS, John Kelly 8 Sep 1898 P ger 164 ACHESON, Lavinia Louisa

Hope that helps.