You are looking at 2 different families, (2 different mothers.)
Charles Philip Hopley born and baptised July 1907 Charles Plymouth (same time as his older sister Winifred)
Parents Philip Hopley (a driver) and
Alice (nee Thomson)Jubilee Street
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Different family ….
Georgina Elizabeth Hopley born 4th May 1907 and baptised St Peters Plymouth
Mother was
Jane Hopley (a hawker)
Granby cottages
Gladys Elizabeth Hopley Baptised Plymouth St Peter 1909
Mother was
Jane Ann Eliza Hopley (hoover seller- similar to hawker)
Granby cottages
Note - The mother, Jane Ann Eliza Hopley, is older sister to Philip Hopely. She married / partnered a John Pullyblank, and had a couple more kids. Children’s births registered under surname Pollyblank.
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You have not given parents names, so we don't know which family in particular you are looking at. Anyway, different families, but related.

Philip and Alice Hopley by 1911 census had 6 children (3 still alive and 3 dead), but I see problems with that. Other children born after 1911 census.