An old message I know! but you mention William Challis and my g.g.grandfather was also William from London, he married Margaret Leonard around 1848 and they lived at Hoxton New Town. My gt grandmother was Margaret Ester Challis b1849
and she married John Conlay 1869, their daughter Martha was my grandmother.
As you have 5 generations I was hoping there just maybe a
connection.
Thanks anyway, Pam Smith