Hello 
The IGI shows the following births - all extracted:
James Dewar  B: 17 NOV 1838 Inverkeithing, Fife, Scotland  Ch: 24 NOV 1838 Inverkeithing, Fife, Scotland  
Ann Dewar - Ch: 24 JAN 1841 Associate Congregation, Inverkeithing, Fife, Scotland 
 
William Dewar - B: 17 JAN 1845 Inverkeithing, Fife, Scotland ch.  27 JAN 1845 Inverkeithing, Fife, Scotland 
Regards,   Steve   :O)