William Richards' (b.1863) father was John Richards (b.1817) Agricultural Labourer, married to a Mary (b.1833) surname unknown. John and Mary had at least five children that I've been able to find. John (b.1860), Emma (1862) William (1863) James Edward (1867) and David (1870)
The 1911 census shows that my grandmother went to work on her uncle John's farm at the age of 14 - that's the John (1860) whose wife's name was also Mary, then sometime after that she went to London and married my grandfather. They lived in Tulse Hill so if the postcards have a postmark on them I'd be very interested to know if they were sent from somewhere near to the Dulwich area.
If there is anyway you could scan the postcards I could give you my email address to send the copies to - how fantastic if it turned out to be my gran's postcards, sent to her brother - but that's really too much to hope for I think.