Both were separated from one or both parents at an early age. Wodehouse was farmed out to boarding schools and relatives in England while his parents lived overseas. Chandler and his mother were deserted by his father. The pair moved to England in part because Chandler's mother hoped to educate her son more cheaply there. After Dulwich, both men tried conventional jobs, Wodehouse in banking and Chandler in civil service, and both soon quit to try journalism. Wodehouse made a success of that and honed his prose style while contributing to various papers and magazines. Chandler didn't; he returned to America, worked his way up in the oil industry and only returned to writing when he lost his job due to the Depression (and his drinking). He then honed his own prose style writing for pulp magazines.
Both men tried their hands at screenwriting in Hollywood, with varying degrees of success. Both married but neither had children. Wodehouse loved mysteries and had fairly catholic tastes, enjoying Edgar Wallace, Ngaio Marsh (whose Inspector Alleyn spelled his name the same way as Dulwich's Edward Alleyn), Agatha Christie, Rex Stout, and Arthur Conan Doyle. But then, mysteries were an escape for Wodehouse, not being his bread and butter. They weren't an escape for Chandler, and he tended to be critical of other mystery writers, especially Golden Age writers like Christie.
I wish now that during my one and only trip to England I'd stopped by Dulwich and tried the local water. It couldn't have hurt.