What do you want to know about him? If I have the right family, according to 1851 census he was born in Edinburgh, was a bookbinder living at Causewayside in Edinburgh. Alexander is 5 and there is a daughter Roseanna who is 1.
Hmm - looks like John may have died fairly young. By 1861 census, if I have the right person, Jane appears to be going by the surname Millar but married to a George Swan! Has she lost 2 husbands in 10 years?? There's another son John M Thomson age 8 also listed as well as a daughter Alexis Swan age 3.