There is information online on Nailsea glassmakers but it's local info and I'm not sure there is copyright permission to pass on links.
There is a long list of Baptisms at Christ Church- amongst them:
There was a Clement baptised 12 May 1844 born to William and Ann Smallman occupation glasscutter
There was a Samuel baptised 16 June 1844 born to Brittan and Albinia Smallman occupation Glass worker.
I presume the occupation relates to the father.
There are a couple of other occupations listed as Glass worker on the list, some Glass man,and some Glass cutter.
There are lots of baptisms with occupations of fathers listed as Glass maker in the 1852 and 1853 and 1855 baptism list in both Nailsea and Christ Church. And some listed as Glass blower. So at that time there seems to have been some occupation in Glassmaking.
On Sep 16 1866 there seems to have been a group baptism of loads of Glass makers children.
The occupation of the father linked to glass making seems to come to a halt completely in 1873! Thereafter none that I could see.
There is also a huge amount of information here:
https://www.b-i-a-s.org.uk/BIAS_Journal_31_NAILSEA_GLASSWORKS.pdfAT some point late 18th they converted from Bottle blowing to window glass according to that.