My goodness, what is it about Andrew's age on the transcripts! From 1851 and the one you mentioned Heather:Mary Dias 53 Cotton Yarn Winder b. Durnoch SutherlandJoseph Dias 22 Hatter (app)Andrew Dias 48 Hatter (app)...FreeCen show 18Eliza Quin 9 lodger b. IrelandAddress: 35 King St Calton
Two more children that don't show in 1881:Jane 1853 https://familysearch.org/pal:/MM9.1.1/X1SS-KL6Thomas 1862 https://familysearch.org/pal:/MM9.1.1/FQ51-R5C