CHEAL family in Windsor

[MelGee]

I am interested in finding further info on Robert CHEAL b.1793 in Lingfield, Surrey.  He was a Royal Warrant holder to carry mail from Windsor to Old Change in London.

I know of two marriages - the first produced the following children:

Elizabeth b. 1817 East Grinstead, Sussex  (was a china and glass dealer in Windsor)
Robert b.1821 in E Grinstead (ran a china shop and was a carrier in Windsor, Berks)
Martha b. 1822 E Grinstead  (was china and glass dealer in Windsor)

I know there are a lot of Cheals in the east Grinstead area but I am descended from children of his second marriage:

Wife was Anna Maria DENNING of Devonport, Devon
Children were:
John Richard  b. 1844 in City of London (married Amelia MUGFORD and had a son Percy John b.1879 in Lympstone, Devon)
Peter Edward  b.1846 in City of London (cannot trace after 1861)
Emily Jane b. 1847 in Windsor, Berks (can find no further trace of her after 1851 census)

I am particularly interested in tracing Peter and Emily as they are not evident in subsequent censuses, though CHEAL is often mistranscribed....

Any help gratefully received!

Thanks,
Mel