This looks like the marriage of the Parents

Name: William Richard Howes
Name: Clara Ellen M Whittard
Record Type: Marriages
Quarter: March
Year: 1893
District: Stroud
County: Gloucestershire
Volume: 6a
Page: 451

The entry for Violet says Westbury on Severn in the BMD transcription whilst her siblings were registered in Stroud. The 1901 however as them down as Stanley / Stoud, not uncommon to see the use of "ditto" marks or an assumption by the Census taker. Dont worry - if only these records were perfect - but then a lot of the fun would go !

with Marion born after 1901....( i.e. not showing in the 1901, and we have a few years to wait for the release of the 1911 data). Does that fit with what you know of Marions age ? < just re-checked -1904 >

Sherwood Forest is about 150 miles North east of the Forest of Dean.