Hi Peter,
I have some information about Sarah Richards, Kate Ellen Richards and Ellen Elizabeth Richards but there may be some surprises here for you!
From birth registrations;
Ellen Elizabeth was born 21 Feb 1900, Holyhead, the daughter of Griffith Richards and Kate Ellen Jones. She seems to have a brother William, born 5 Aug 1902, Holyhead, the son of Griffith Richards and Kate Jones.
I found a marriage:
Griffith Richards, 25, bach., draper of Cybi House, Holyhead the son of William Richards, policeman and Kate Jones, 22, spin., of Ogof Farm, Holyhead the daughter of William Jones, farmer on 7 Nov 1899 at Bethel Chapel, Holyhead.
It seems Sarah Richards (1830) married twice:
21 May 1852 at Llaneugrad Church - Sarah Richards spinster of Parciau, daughter of Michael Richards, farmer and John Jones, widower of Frigan Fawr, farmer, son of Edward Jones (no occupation given).
I can find birth registrations for two children of Sarah Richards and John Jones:
John born 2 Jun 1853, Llaneugrad
William born 26 Jul 1855, Llaneugrad
The 1861 census for Frigan, Llaneugrad shows (all born Anglesey):
John Jones, head, 50, farmer of 550 (or perhaps 350) acres.
Zarah .. , wife, 31
Edward .. , son, 23
Lydia .. , dau, 15
Elizabeth .. , dau, 13
John .. , son, 7
Owen Williams, serv, 16, carter
(Frigan was associated with the Bulkeley family about 50 years earlier, it seems).
I found two death registrations which I think are relevant:
30 Jun 1861 at Llaneugrad - John Jones, 49, farmer. Informant William Jones.
30 Jul 1858 at Llaneugrad - William Jones, 3, son of farmer John Jones. Informant Margaret Jones.
NorthWalesBMD has the marriage of Robert Richards and Sarah Jones (formerly Richards) at Bangor Cathedral in 1861. FreeBMD has the same marriage Bangor 11b 661 (J,A,S qtr - seems remarkably soon after the death of her first husband?).
I can find only one child born to Robert Richards and Sarah on Anglesey:
Catherine dau. of Robert Richards and Sarah Richards (widowed name Jones) - 2 May 1862, Llaneugrad.
Finally, I found these death registrations:
Sarah Richards, 7 Mar 1901, age 71, at Bryntirion, Trefdraeth, wife of farmer Robert Richards. Informant Kate Richards, daughter.
Robert Richards, 26 Apr 1902, age 65, at Bodragolwyn (?), Trefdraeth, farmer. Informant Kate Richards, daughter.
I hope you find this of interest,
Regards,