I also meant to add that I believe two of the children you mentioned sadly died within their first year:

Civil Registration event: Birth
Name: YEMM, Frank
Registration District: Westbury on Severn
County: Gloucestershire
Year of Registration: 1867
Quarter of Registration: Jul-Aug-Sep
Volume No: 6A
Page No: 219

Civil Registration event: Death
Name: YEMM, Frank
Registration District: Westbury on Severn
County: Gloucestershire
Year of Registration: 1868
Quarter of Registration: Jan-Feb-Mar
Age at death: 0
Volume No: 6A
Page No: 162

Civil Registration event: Birth
Name: YEMM, Ernest Joseph
Registration District: Westbury on Severn
County: Gloucestershire
Year of Registration: 1877
Quarter of Registration: Apr-May-Jun
Volume No: 6A
Page No: 254

Civil Registration event: Death
Name: YEMM, Ernest Joseph
Registration District: Westbury on Severn
County: Gloucestershire
Year of Registration: 1878
Quarter of Registration: Jan-Feb-Mar
Age at death: 0
Volume No: 6A
Page No: 169