Hi again
Great! Now you can ignore the trees for George Simmons/Charity and Dora Turner, they are nothing to do with your family.

The birth certificate will confirm Arthur's mother's maiden name, his father's name and occupation.
Unfortunately at the moment there is the problem of your George and Dora's marriage which using the names Simmonds/ Simmons and Webster I can't find in the UK! Is there any chance they went to Canada separately, married over there, then returned to UK with their two oldest children?
In the 1861, '71', '81 and 91 census Dora says she was born Eddlesborough Buckinghamshire but in 1901 she says Northchurch Hertfordshire and in 1911 it is Dunstable Bedfordshire. I will take a look at google maps and see how far apart these places are.
George is consistent with his birthplace.