Violet G M Bentley was b. 1908 in Petworth, Sussex (q3 1908 2b 903 ) so no mmn. listed which doesnt help tracing the other siblings for Violet, do you know the mmn ?
i found this marriage which is also Sussex
Marriages Q4 1903 Thakeham 2b 718
BENTLEY Richard
ELLIOTT Emily Murcy
so for children born to Bentley / Elliott matches Q4 1911 - Q4 1920 there are 10 scattered all over the Country but none in Petworth or Thakenham

the only two round about this area are :~
BENTLEY Walter R mmn. Elliott Midhurst.2b 667 Q3 1912
BENTLEY Bessie E M mmn. Elliott Guildford.2a 175 Q2 1918