Hi Chris,
welcome to rootschat

The parents' marriage was in 1889, Jonathan Holland to Elizabeth Emily Claxton
Freebmd shows about 10 infant deaths for the surname Holland in Middlesbrough from 1889 to 1911, the only way to find out if their mother's maiden name was Claxton is by checking with the register office, who only confirm those details if you are going to buy the certificates.
Perhaps you could email Middlesbrough register office to ask if any of those children had a mother Emily with maiden name Claxton
register [at] middlesbrough.gov.uk
or you could email Middlesbrough cemeteries office to ask if they can give you parent information from their burial details
contact details given a few replies earlier on this page
Barbara
