Hello
Its always a good idea to get the death certificate it will give you where she died if she died in ot but it will give who registered the death
death info Ellen Lydon 3rd qtr, 1930 vol 1ba page 526 district holyhead aged 57yrs
Joseph Lydon 2nd qtr, vol 11b page 631 district holyhead aged 57yrs
They both died young how sad.
I looked up your family 1911 census
RG14 PN10252
16 Coastgaurd Buildings Harwich Essex
Lydon
Joseph 42yrs chief officer coastgaurd b. Salby County Galaway
Ellen wife 38y b Wick scotland
Mary daugh 17y bWeymouth Dorset
Alexandri Ona14y b Leith Scotland
Ellen 12y b as above
Norah 9y b Granton Edinburgh
Christina M 5y bottle Liverpool
William son 4y b Holyhead Angalsey
Isabella 3y as above
Josepg 2y b as above
They must have gone back to Anglesey later looking at this I would have to get their death certificate to see where they where living .
Did any of the family stay in north wales?
Hope this helps
cheers cardiff

PS
Reg district is Anglesey
Reg office
Shirehall
Glanhwfa Rd
Llangefni Anglesey LL77 7TW