Hi
Unless they had a readable engraved headstone - just looking around the cemetary would not find their grave or their death dates. The plot number is needed
You would first have to establish what year they each died (see below).
Their actual death dates will only be obtained by buying a copy of their respective death certs
Using their actual death dates, it may then be possible to obtain the plot number from the records office
As they were only born in 1887 - they could have still been alive in the 1950's or 1960's.
Do you have any clues as to an approximate year in which they died to narrow it down?
If not - you will have to search the full GRO index on a quarter by quarter basis from a year when you know they were alive (birthyear of last child)
The full GRO index is available at your nearest main library if you live in the UK. It can also be searched online if you have an Ancestry subscription or at
www.findmypast.com which is a paysite
