hi there
I've had quick look for marriage of any SCOTT to LAWSON in scotland between 1826 - 1854 and also looked the the 1861 census and can't find the family. Where was Catherine married as there's only one Catherine Scott married in Midlothian 1869 and it's not her.Altho Catherine might have been from Edinburgh at the time of her marriage it doesn't mean she was born there.

below is list of SCOTT - LAWSON marriages

1 20/12/1829 SCOTT ANDREW ANN LAWSON/ M FOWLIS WESTER /PERTH 357/00 0040 0015
2 18/10/1835 SCOTT DAVID CHRISTIAN LAWSON/ M MIDMAR /ABERDEEN 222/00 0020 0246
3 06/12/1832 SCOTT GEORGE MARTHA LAWSON/FR1173 M ST CUTHBERT'S EDINBURGH CITY CITY/MIDLOTHIAN 685/02 0420 0428
4 19/06/1852 SCOTT GEORGE ISABEL LAWSON/FR273 M ALFORD /ABERDEEN 171/00 0020 0089
5 07/11/1827 SCOTT JAMES JANET LAWSON/ M FORGAN /FIFE 431/00 0020 0116
6 24/11/1827 SCOTT JAMES JANET LAWSON/FR661 M STRATHMIGLO /FIFE 457/00 0040 0098
7 30/11/1844 SCOTT RICHARD ELISABETH LAWSON/ M LIFF, BENVIE AND INVERGOWRIE /ANGUS 301/00 0040 0233
8 24/05/1828 SCOTT THOMAS ELEAN LAWSON/FR247 M FALA AND SOUTRA /MIDLOTHIAN 686/00 0020 0060
9 21/09/1846 SCOTT THOMAS JANE LAWSON/FR815 M CARLUKE /LANARK 629/00 0030 0283
10 18/05/1839 SCOTT WILLIAM HELEN LAWSON/FR1177 M LESMAHAGOW /LANARK 649/00 0050 0137