According to a family tree handed down to me, my great grandfather and mother were Isabella Thexton and Thomas Ward. This family tree says it was compiled by Winifred Thexton, of Calder Garth, The Banks, Seascale, Cumbria in 1988.
Isabella was the sister of the John Thexton (who apparently died in 1914 having married Sarah Anne Butler who died in 1941) to whom you refer
Isabella and John and 10 other brothers and sisters (whose names are on this tree) were the issue of George Thexton (1819-1845 and married to Isabella Walker), who together with 9 other brothers and sisters (again names on the tree)was the issue of John Thexton of Underbarrow (1782-1869) who married a Mary Lightburn at Ulverston.
This tree also tells me some details about the issue of John Thexton and Sarah Anne Butler as follows - Confirms son William died 1898 Confirms Eveline and says she died 1930 having married a Mr W Wearing. Confirms George and says he died 1958 having married a Miss A Wilde. Says there was also a Maggie who died in 1950. Says there was also a Bertha who married a Mr F Ames. Says there was also a Helen who married a Mr BH Lawton Says there was also a Winifred (who compiled the tree) Says there was also Gertrude who married a Mr F Ball. Makes no mention of Bridget Ann.
I hope that this helpful but would emphasise that I have no idea how accurate it is - it was not my research.