Not sure which Sidney this is?? although previous thread gives the 1911 census mother : Martha

1911 Census, Causeway, Cinderford (living in 4 rooms)

Martha GRINDLE - 52 Widow, born Alvestcott, Oxon
William FENNELL - boarder - 29 - Coal Hower, born Yorkley
Sydney GRINDLE - son - 14 - Hauling (underground) born Cinderford
John PELL - Grandson - 3 - born London.

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Looking at British Newspapers on line - there are about 4+ articles (if you search for Sidney GRINDLE).....

As I don't subscribe, can just reach brief outlines : from 1907 til 1911 - some talk of his widow mother Martha

and include

1907 GloucesterJournal District & Parish Intelligence

defendent would sent for one month;s hard labour. Sidney GRINDLE a boy of Littledean Hill, was summoned for assaulting Archibald DAVIES, another boy of the same place - on the 23 September - John GRINDLE, George BEVAN and William BEVAN, Colliers, Littledean.

etc etc