Thanks to all for putting this work in; it's enabled me to clarify and verify some details, not least that the reported birth of a dau to Mrs Wm John Kernohan in 1976 was not Ellen May but her younger sister Florence Kate (1876 - 1934). Yes she had other siblings, Walter H (died young) and William John (jnr), who died in October 1967.
So we still don't have a surname for Sylvia Marie- and, believe me, I've spent hours going through Trove with all the combinations I can think of, l but the OCR is somewhat capricious and occasionally throws up some howlers (e.g. "the oily daughter of..." and "sadly missed by his roving wife"). There's a stand-up routine in there somewhere!
This also leaves whether William Leonard and Sylvia Marie had either previously married, and whether they had children other than step-children. Clearly their grave was updated on her death in 1986 by someone, and that would be interesting to know.
As for Liverpool, my interests are mostly confined to my own tree, which includes Cornish (originally from Frome, Somerset), Piggott, Gaffney, Heap, Sandilands and Parkes, plus Waddington of Cotham, Lincolnshire and Nash of Wandsworth/Clapham.
Cheers!