Robert Brooks tells me that their marriage certificate shows they were married at the parish church of St Mary's Stratford Bow, Poplar.

Chris Dufton's Family History web site shows us the following information about Robert George East:

1851 living at 14 Essex Street, Bethnal Green, London, Robert East, Son, Age 7, Born Standon Herts, Scholar .
1861 living at 3 Langport Place, Lambeth, London, Robt G East, Son, Age 17, Born Standon Herts, Engineer .
1871 living at 26 Whitaker, Litchurch, Derbyshire, Robert G East, Head, Age 27, Born Standon Herts, Mechanical Draughtsman .
1881 living at 88 Uttoxeter New Road, Derby, Derbyshire, Robert G East, Head, Age 37, Born Standon Herts, Mechanical Draughtsman .
1891 living at 459 Harrow Road, Chelsea, London, Robert G East, FinLaw, Age 47, Born Standon Herts, Draughtsman .
1901 living at 9 Alma Road, Wandsworth, London, Robert G East, Head, Age 57, Born Standon Herts, Mechanical & Mining Engineer .
__________

We can see Robert East and his wife in 1881 living at 88 Uttoxeter New Rd, Derby, England

Robert G. EAST Head M Male 37 Standon, Hertford, England Mechanical Draughtsman (E & M Maker)
Frances EAST Wife M Female 31 St Georges East, Middlesex, England
Alice R. EAST Daur Female 12 Earls Colne, Essex, England Scholar
Augustus G. EAST Son Male 10 London Bow, Middlesex, England Scholar
Ada F. EAST Daur Female 9 Derby, Derby, England Scholar
Edith E. EAST Daur Female 7 Derby, Derby, England Scholar
Arthur R. EAST Son Male 5 Derby, Derby, England Scholar
Henry T. EAST Son Male 4 Derby, Derby, England
Frederick W. EAST Son Male 1 Derby, Derby, England
__________

I'm told by Robert Brooks, a descendant of his, that Robert served an apprenticeship to an engineer and millwright based in Southwark, London. The indentures are signed by Robert George and his father Robert. It's believed that he then attended Trinity College, Dublin completing a mechanical engineering course/degree. He worked on plans for the Mersey tunnel and a project for a Humber bridge.

Robert hasn't been able to establish where or when he died, but believes he and Frances were buried in Chesterfield, where one of their
son`s lived.

Frances' father, Henry Theodore Knibbs isn't strictly a member of the Knibbs family. His parents were John and Ann BURT so his real name is Henry Theodore BURT. Henry's mother was widowed and then married Francis Knibbs (1793-1856).
Henry married as Henry Theodore BURT but at a later date, he assumed the surname KNIBBS.

Francis was born in 1850, but we believe it's her recorded as FranCIS rather than FranCES in the general register.

We learn from Chris Dufton that Alice married Samuel L Bryan on 25 Feb 1888 in Paddington, London, Middlesex, England

We learn from Cgris Dufton that Augustus married Florence Mary Massey in Dec 1896 in Loughborough, Leicestershire, England

Frances married a man named George Winfield in 1896, probably in Chesterfield.

We learn from Chris Dufton that Edith Ellen married Jan Rutgert Schuymer in 4 Nov 1899 in Wandsworth, London, Middlesex, England.

We learn from Chris Dufton that Henry Theodore east married Florence Edith Schuymer in Sep 1899 in Leeds, Yorkshire, England.

Frederick married Frances Rose Ward on 6 Nov 1909 in Wandsworth, London, England. They had 7 children. His wife Frances was born on 25 Jul 1882 at Clondalkin, South Dublin, Ireland.

Herbert married Mabel Ellen Morris on 24 Dep 1904. Mabel was born in Cardiff, Wales c.1880.