Family: Living / Living (F29165)
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 | James Young Thewlis (1883-1959)
|
 | Helen McMahon (1891-1978) |
| Kathleen Thewlis (1915-1915) |
| James McMahon Thewlis (1916-2011)  |
| Mary Thewlis (1919-1921) |
| William Oswald Thouless (1923-1995) |
| Brian Thewlis (1930-1943) |
| Maurice Thewlis (1931-1934) |