Further to Romain's descrption below: My grandfather was Elwin de Zylva and father Irving Kenneth de Zylva. Aunty Elsie was my grand aunt.
We migrated to Australia (Melbourne) in 1968 when I was 12 years of age.
I do have a genealogy that was required in our endeavours to migrate as Australia had a ghastly White Australia Policy in those days.
Make contact and let's see how we can share information.
I have been to Whitby in northern England to trace the Pinder name (the maiden name of Aunty Elsie's mum) - and a name I assumed for a number of good reasons.
Have five or six generations of the De Zylva clan that I can send to you.