Hi Lolita, I am descended from Maria Nightingale Walthew. She had a sister Harriet Caroline Walthew if u wld like details.
Their mother Maria Hall was born in Gt Yarmouth, dtr of Wm Hall, a baker, and Elizabeth Nightingale. She had 2 sisters if u are interested. I have not been able to trace Wm Hall's parentage but think Elizabeth Nightingale was dtr of Samuel Nightingale and Ann Pashby of Gt Yarmouth.
Re George Molyneux Walthew - he died in Dublin 6 Jan 1870 age 70 (info from obit in Freemans Journal - Irish newspaper)
He was indeed a hatter and general pillar of Dublin society. His business was at 13 College Green, Dublin and lived at Norfolk Cottage, Park Avenue, Sandymount, Donnybrook, Dublin.
He married Maria Hall in 1833 but there no marriage cert survives only a short record on a list apparently.
The legend came down my family too that he was descended from the Earl of Sefton but I have found no link to prove it.
All I know for sure is that he was related to some other Walthews who lived in Anglesey, North Wales. One of these Walthews was actually mayor of Holyhead. I know this because my father was born in Anglesey while his father (Cranswick Walthew Greenhill) was bldg a road there for the Walthews.
It has been suggested he could have been born in Stockport, nr Manchester. Stockport was a hatting town and full of Walthes, but I have nfound no definite proof of that either