I'm wondering if Robert was previously married before he married Charlotte. There is a big gap between Deborah and Emily.
Two possible birth registrations for Deborah Jones:
Wrexham
Mar q, 1869, vol 11b, page 322
and
June q, 1869 vol 11b, page 300
The first is most likely because of the timing of the census but it could be the second if it was a late registration.
Gadget