If you are still searching for his mother's surname it might be worth purchasing John's marriage certificate.
Ted
See below-
First name(s) JOHN
Last name LATH
Marriage quarter 1
Marriage year 1873
Registration month -
MarriageFinderâ„¢ JOHN LATH married one of these people
SARAH ANN KITSON, HARRIET LONGDEN
District SHEFFIELD
District number -
County Yorkshire
Country England
Volume 9C
Page 522
Record set England & Wales marriages 1837-2008
Category Birth, Marriage, Death & Parish Records
Subcategory Marriages & divorces
Collections from Great Britain