Found the likely family in 1851 Hawick (image online at ScotlandsPeople):
Andrew Holdon, 26, Framesmith Journeyman
Wife Elizabeth, 24
Children Robert 8, Elizabeth 6, Phemy ?3 and Andrew 1
All born Dumfries, all listed at lodgers, so no clear relationships noted
Living in Kirkgate, Hawick
So they must have moved to Hawick very recently.