Information wanted on this husband and wife- JOHN FAIR AND ISABELLA ALLAN

I have only their marriage 17 DEc 1832 Sth Leith,  no other info on either of them, other than Johns wife- Isabella Allan she was born <1810> Sth Leith daughter of William Allan/Isabella Atchison.

John and Isabella had two children both born South Leith

                                         - John Fair b 14/09/1836                                   

                                         - Isabella Fair b 5/08/1834

John was a rope and sail maker and a merchant seaman at the time of his marriage. 

On 1841 Census North Leith 692/01 015/01 007 South Fort Street young John and his sister are living with a John Robertson and family, but no sign of their parents.

I am a descendant of Isabella Fair b 1834 she married Henry Richardson 1861