I see from other posts of yours we are looking at the same people.
Im a Crawford and have some issues tracing that back beyond a Crawford marriage in 1838 in Glasgow before getting on a boat to Aus in 1849. Cant trace Crawfords back any further. I had an ancestry match with someone descending from the Crawford, Craig, Marshall line so ive been trying to take the info from this persons tree and trace it back further into the Crawford history to see if anything matches what i do know. That way trying to see if my ancestry match is indeed via the Crawford angle.
So in the census, one thing i find interesting is the note in the condition column for Agnes C. "Husband in workhouse"...if ive understood correctly. Implying that he might still be around at that point.