Mary Ann Stephens married William Plumpton
26 June 1826 Warrington, Lancashire.

1851 Census Lancashire, has,

William Plumpton 48 Lancashire, Penketh
Mary Plumpton 48 Isle of Man

Making Her birthdate / baptism c1803
I have found on the online IGI
Mary Stephen
2 June 1803 Ballaugh
Father, Wm Stephen ( a submitted form )

1851 Census Isle of Man, Ballaugh, Intack

William Stephen 65 Isle of Man, Ballaugh
Catherine Stephen 63 Isle of Man, Ballaugh
Robert Kelly grandson 5 IOM Michael

But I cannot find a Marriage for,

William Stephen and Catherine c 1803
Am I on the right tree ?
Thankyou, Averil