I'm not finding them in Bridge Street or that area in 1841.
On the 1851, the children after David are:
Margaret - 8, Catherine - 6. Elizabeth - 4, John - 3, Hugh 1
In 1861, the children look as if they are down as being born Ross (?Rhos or Rossett??) but them Wrexham in 1871!
Do you know Elizabeth's maiden name and when they married?
Gadget